BASELINE: Update Chromium to 64.0.3282.139

Change-Id: I1cae68fe9c94ff7608b26b8382fc19862cdb293a
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

22 files changed, 1332 insertions, 13 deletions

diff --git a/chromium/components/language/BUILD.gn b/chromium/components/language/BUILD.gn
new file mode 100644
index 00000000000..b77574817d2
--- /dev/null
+++ b/chromium/components/language/BUILD.gn
@@ -0,0 +1,49 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/compiler/compiler.gni")
+
+action("make_s2_language_locator") {
+  script = "convert_s2_cell.py"
+  sources = [
+    "adminregionsdata.csv",
+  ]
+  inputs = [
+    "template/language_code_locator_helper.cc.tmpl",
+  ]
+  outputs = [
+    "$target_gen_dir/language_code_locator_helper.cc",
+  ]
+
+  args = [
+    "-o=" + rebase_path(outputs[0], root_build_dir),
+    "-t=" + rebase_path(inputs[0], root_build_dir),
+    "-i=" + rebase_path(sources[0], root_build_dir),
+  ]
+}
+
+source_set("language_code_locator") {
+  sources = [
+              "language_code_locator.h",
+              "language_code_locator.cc",
+            ] + get_target_outputs(":make_s2_language_locator")
+  deps = [
+    ":make_s2_language_locator",
+    "//base",
+    "//third_party/s2cellid",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "language_code_locator_unittest.cc",
+  ]
+  deps = [
+    ":language_code_locator",
+    "//base",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}
diff --git a/chromium/components/language/DEPS b/chromium/components/language/DEPS
index a6d4a63679f..63176428e4b 100644
--- a/chromium/components/language/DEPS
+++ b/chromium/components/language/DEPS
@@ -1,8 +1,7 @@
 include_rules = [
   "+components/pref_registry",
   "+components/prefs",
+  "+third_party/s2cellid",
 
-  # Language is a layered component; subdirectories must explicitly introduce
-  # the ability to use the content layer as appropriate.
   "-components/language/content",
 ]
diff --git a/chromium/components/language/OWNERS b/chromium/components/language/OWNERS
index 3e79d25e498..77a0ab06cb2 100644
--- a/chromium/components/language/OWNERS
+++ b/chromium/components/language/OWNERS
@@ -1,6 +1,8 @@
 dvallet@chromium.org
 sammc@chromium.org
 jiameng@chromium.org
+renjieliu@chromium.org
+martis@chromium.org
 
 # TEAM: language@chromium.org
 # COMPONENT: UI>Browser>Language
diff --git a/chromium/components/language/README b/chromium/components/language/README
index e4c4821cc4c..15ce9d425c3 100644
--- a/chromium/components/language/README
+++ b/chromium/components/language/README
@@ -13,3 +13,7 @@ content/: Driver for the shared code based on the content layer.
   renderer/: Renderer process code.
   common/: Code shared by the browser and the renderer.
 ios/: Driver for the shared code based on src/ios.
+
+Note:
+The language code locator is built on all platforms but iOS since iOS currently
+does not support //device/geolocation. See http://crbug.com/774879 for details.
diff --git a/chromium/components/language/adminregionsdata.csv b/chromium/components/language/adminregionsdata.csv
new file mode 100644
index 00000000000..bbc58dcc2b4
--- /dev/null
+++ b/chromium/components/language/adminregionsdata.csv
@@ -0,0 +1,37 @@
+name,feature_id,languages,cell_ids
+"Andaman and Nicobar Islands","0x3064a00f2b650ff3:0xce80055648fccb2c","hi;bn;ta;te;ml","0x3062a90000000000;0x3062ab0000000000;0x3062ad0000000000;0x30635f0000000000;0x3063610000000000;0x30642d0000000000;0x30642e7000000000;0x3064935000000000;0x306494b000000000;0x30649f0000000000;0x3064a10000000000;0x3064eb5400000000;0x3064ecaab0000000;0x306501c000000000;0x306507f000000000;0x3065084000000000;0x30658d0000000000;0x30658e4000000000;0x3065910000000000;0x3065930000000000;0x3065a14000000000;0x3065a3c000000000;0x3065a50000000000;0x3065a70000000000;0x3065a90000000000;0x3065c10000000000;0x3065c30000000000;0x3065c50000000000;0x3065c6b000000000;0x3065d30000000000;0x3065dd5554000000;0x3065e50000000000;0x3065e70000000000;0x3065ec0000000000;0x3065f04000000000;0x3065f30000000000;0x3065fab000000000;0x3068cb0000000000;0x3068ccb000000000;0x3068d40000000000;0x3069250000000000;0x3069270000000000;0x30692c0000000000;0x3069340000000000;0x30693a0c00000000;0x306ed30000000000;0x306ed50000000000;0x306ed70000000000;0x306f2c0000000000;0x306f310000000000;0x306f330000000000;0x306f350000000000;0x306f36c000000000;0x306f4a9000000000;0x307d550000000000;0x307d56c000000000;0x3086310000000000;0x3086390000000000;0x30863b0000000000;0x3087c1fc00000000;0x3087c24000000000;0x3087e30000000000;0x3087e4ab00000000;0x3087e9fc00000000;0x3087ea0100000000;0x3087f94000000000;0x3087fb0000000000;0x3087fd0000000000;0x3087ff0000000000;0x3088040000000000;0x30880c0000000000;0x3088127c00000000;0x3088128400000000;0x3088610000000000;0x3088630000000000;0x308865d000000000;0x30886cc000000000;0x3088850000000000;0x3088870000000000;0x3088890000000000;0x30888dc000000000;0x30888f0000000000;0x3088940000000000;0x3088990000000000;0x30889b0000000000;0x30889d0000000000;0x3088a30000000000;0x3088a50000000000;0x3088a70000000000;0x3088a8c000000000;0x3088ad0000000000;0x3088af0000000000;0x3088b40000000000;0x3088bc0000000000;0x3088c7c000000000;0x3088c84000000000;0x3088cdc000000000;0x3088d10000000000;0x3088d30000000000;0x3088d4c000000000;0x3088d70000000000;0x3088d90000000000;0x3088db0000000000;0x3088df4000000000;0x308c1b0000000000;0x308d86c000000000;0x308ed5c000000000;0x308f050000000000;0x308f070000000000;0x308f0c0000000000;0x308f140000000000;0x308f190000000000;0x308f1b0000000000;0x308f22c000000000;0x308f25d000000000;0x308f270000000000;0x308f290000000000;0x308f2b0000000000;0x308f2d0000000000;0x308f2eb000000000;0x308f310000000000;0x308f350000000000;0x308f370000000000;0x308f3c0000000000;0x308f440000000000;0x308f4c0000000000;0x308f52c000000000;0x308f6c0000000000;0x308f730000000000;0x308f750000000000;0x308f770000000000;0x308f910000000000;0x308f93c000000000;0x308f944000000000;0x308f975000000000;0x308f9c0000000000;0x308fa40000000000;0x308fa84000000000;0x308fafc000000000;0x308fb10000000000;0x308fb3fc00000000;0x308fb50000000000;0x308fb70000000000;0x308fbc0000000000;0x308fd00000000000;0x3090270000000000;0x3090284000000000;0x309029c000000000;0x30902b0000000000;0x30902d0000000000;0x30902f0000000000"
+"Andhra Pradesh","0x3a3546f8ae93d47f:0x33d1bbbe95adcd83","te;ur;hi;ta","0x3a30ac0000000000;0x3a30b40000000000;0x3a30cc0000000000;0x3a30d2c000000000;0x3a31354000000000;0x3a314aac00000000;0x3a342c0000000000;0x3a34340000000000;0x3a344b0000000000;0x3a35040000000000;0x3a350c0000000000;0x3a35140000000000;0x3a353c0000000000;0x3a35500000000000;0x3a35700000000000;0x3a35c00000000000;0x3a36400000000000;0x3a36840000000000;0x3a368c0000000000;0x3a36940000000000;0x3a36b00000000000;0x3a36d00000000000;0x3a36f00000000000;0x3a37400000000000;0x3a37c00000000000;0x3a38030000000000;0x3a381c0000000000;0x3a38240000000000;0x3a382c0000000000;0x3a3832c000000000;0x3a390c0000000000;0x3a3912c000000000;0x3a39440000000000;0x3a39540000000000;0x3a395c0000000000;0x3a39700000000000;0x3a39900000000000;0x3a39a40000000000;0x3a39b40000000000;0x3a39bc0000000000;0x3a39d00000000000;0x3a39f00000000000;0x3a3a100000000000;0x3a3a300000000000;0x3a3a440000000000;0x3a3a4c0000000000;0x3a3a640000000000;0x3a3a6c0000000000;0x3a3a740000000000;0x3a3b07c000000000;0x3a3b0c0000000000;0x3a3b5c0000000000;0x3a3b700000000000;0x3a3bc00000000000;0x3a3c040000000000;0x3a3c0c0000000000;0x3a3c140000000000;0x3a3c1ab000000000;0x3a3c370000000000;0x3a3c3c0000000000;0x3a3c500000000000;0x3a3c700000000000;0x3a3c900000000000;0x3a3ca10000000000;0x3a3cf40000000000;0x3a3cfc0000000000;0x3a3d100000000000;0x3a3d3ff000000000;0x3a3d440000000000;0x3a3d5d4000000000;0x3a3d67c000000000;0x3a3d6c0000000000;0x3a3d730000000000;0x3a3da70000000000;0x3a3dac0000000000;0x3a3db30000000000;0x3a48240000000000;0x3a482c0000000000;0x3a49840000000000;0x3a498c0000000000;0x3a49940000000000;0x3a499b0000000000;0x3a49c40000000000;0x3a49d40000000000;0x3a49dc0000000000;0x3a49f00000000000;0x3a4a100000000000;0x3a4a240000000000;0x3a4a284000000000;0x3a4a3c0000000000;0x3a4a440000000000;0x3a4a4f0000000000;0x3a4a540000000000;0x3a4a5c0000000000;0x3a4a700000000000;0x3a4ac00000000000;0x3a4b400000000000;0x3a4ba70000000000;0x3a4bac0000000000;0x3a4c540000000000;0x3a4c5c0000000000;0x3a4c640000000000;0x3a4c7c0000000000;0x3a4cc00000000000;0x3a4d400000000000;0x3a4d840000000000;0x3a4d8c0000000000;0x3a4d900000100000;0x3a4d9c0000000000;0x3a4da40000000000;0x3a4dac0000000000;0x3a529c0000000000;0x3a52a40000000000;0x3a52ac0000000000;0x3bad500000000000;0x3bad700000000000;0x3bad840000000000;0x3bad940000000000;0x3bad9c0000000000;0x3bada40000000000;0x3badaf0000000000;0x3badb40000000000;0x3badbc0000000000;0x3badc40000000000;0x3badcc0000000000;0x3bb0454000000000;0x3bb04c0000000000;0x3bb0540000000000;0x3bb05c0000000000;0x3bb0b40000000000;0x3bb0d00000000000;0x3bb0f00000000000;0x3bb1400000000000;0x3bb1840000000000;0x3bb1940000000000;0x3bb19c0000000000;0x3bb1a40000000000;0x3bb1ac0000000000;0x3bb1bc0000000000;0x3bb2140000000000;0x3bb2300000000000;0x3bb2500000000000;0x3bb2700000000000;0x3bb2c00000000000;0x3bb3400000000000;0x3bb3c00000000000;0x3bb4400000000000;0x3bb4c00000000000;0x3bb5400000000000;0x3bb5900000000000;0x3bb5b00000000000;0x3bb5d00000000000;0x3bb5e40000000000;0x3bb5ec0000000000;0x3bb5f2c000000000;0x3bb60c0000000000;0x3bb6140000000000;0x3bb6340000000000;0x3bb63c0000000000;0x3bb6500000000000;0x3bb6700000000000;0x3bb6c00000000000;0x3bb7040000000000;0x3bb7140000000000;0x3bb71c0000000000;0x3bb7300000000000;0x3bb7410000000000;0x3bb74c0000000000;0x3bb76b0000000000;0x3bb7a5c000000000;0x3bb7a64000000000;0x3bb7ac0000000000;0x3bb7b40000000000;0x3bb7cc0000000000;0x3bcaac0000000000;0x3bcab40000000000"
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diff --git a/chromium/components/language/convert_s2_cell.py b/chromium/components/language/convert_s2_cell.py
new file mode 100644
index 00000000000..b9646677260
--- /dev/null
+++ b/chromium/components/language/convert_s2_cell.py
@@ -0,0 +1,83 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Generate c++ structure mapping position to language code from .csv input."""
+
+import argparse
+import csv
+import os.path
+import string
+import sys
+
+sys.path.insert(1,
+    os.path.join(os.path.dirname(__file__),
+    os.path.pardir,
+    os.path.pardir,
+    "third_party"))
+import jinja2 # pylint: disable=F0401
+
+
+CELL_ID_FIELD = "cell_ids"
+LANGUAGE_FIELD = "languages"
+
+
+def ParseInputCsv(input_path):
+    """Derive cell_id : language_code pairs."""
+    district_with_languages = []
+    with open(input_path, "r") as f:
+        reader = csv.DictReader(f, delimiter=",")
+        for row in reader:
+            district_with_languages.append((row[LANGUAGE_FIELD],
+                                            row[CELL_ID_FIELD]))
+    return district_with_languages
+
+
+def ExtractCellIds(language_districts):
+    """Convert <language code>: [<cell_ids>...] into
+       a list of cell_id : language_code pairs."""
+    cell_language_code_pairs = []
+    for language_code, cell_ids in language_districts:
+        cell_ids = cell_ids.split(";")
+        for cell_id in cell_ids:
+            cell_language_code_pairs.append((cell_id, language_code))
+    return cell_language_code_pairs
+
+
+def GenerateCpp(output_path, template_path, cell_language_code_pairs):
+    """Render the template to generate cpp code for LanguageCodeLocator."""
+    with open(template_path, "r") as f:
+        template = jinja2.Template(f.read())
+        context = {
+            "cell_lang_pairs" : cell_language_code_pairs
+        }
+        generated_code = template.render(context)
+
+    # Write the generated code.
+    with open(output_path, "w") as f:
+        f.write(generated_code)
+
+
+def Main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+      "--outputs", "-o", required=True,
+      help="path to the generate c++ file")
+    parser.add_argument(
+      "--template", "-t", required=True,
+      help="path to the template used to generate c++ file")
+    parser.add_argument(
+      "--inputs", "-i", required=True,
+      help="path to the input .csv file")
+    args = parser.parse_args()
+
+    output_path = args.outputs
+    template_file_path = args.template
+    data_file_path = args.inputs
+
+    cell_language_code_pairs = ExtractCellIds(ParseInputCsv(data_file_path))
+
+    GenerateCpp(output_path, template_file_path, cell_language_code_pairs)
+
+if __name__ == "__main__":
+    Main()
diff --git a/chromium/components/language/core/browser/BUILD.gn b/chromium/components/language/core/browser/BUILD.gn
index e177866fb90..ae7553ba902 100644
--- a/chromium/components/language/core/browser/BUILD.gn
+++ b/chromium/components/language/core/browser/BUILD.gn
@@ -6,8 +6,12 @@ static_library("browser") {
   sources = [
     "baseline_language_model.cc",
     "baseline_language_model.h",
+    "heuristic_language_model.cc",
+    "heuristic_language_model.h",
     "language_model.cc",
     "language_model.h",
+    "pref_names.cc",
+    "pref_names.h",
     "url_language_histogram.cc",
     "url_language_histogram.h",
   ]
@@ -24,6 +28,7 @@ source_set("unit_tests") {
   testonly = true
   sources = [
     "baseline_language_model_unittest.cc",
+    "heuristic_language_model_unittest.cc",
     "url_language_histogram_unittest.cc",
   ]
   deps = [
diff --git a/chromium/components/language/core/browser/baseline_language_model.cc b/chromium/components/language/core/browser/baseline_language_model.cc
index 767a62a001e..dac41b295f4 100644
--- a/chromium/components/language/core/browser/baseline_language_model.cc
+++ b/chromium/components/language/core/browser/baseline_language_model.cc
@@ -14,9 +14,6 @@ namespace {
 constexpr float kUrlLanguageFreqCutoff = 0.3f;
 }  // namespace
 
-const base::Feature kUseBaselineLanguageModel{"UseBaselineLanguageModel",
-                                              base::FEATURE_ENABLED_BY_DEFAULT};
-
 BaselineLanguageModel::BaselineLanguageModel(
     PrefService* const pref_service,
     const std::string& ui_lang,
diff --git a/chromium/components/language/core/browser/baseline_language_model.h b/chromium/components/language/core/browser/baseline_language_model.h
index 86b92996d63..40dbca3c465 100644
--- a/chromium/components/language/core/browser/baseline_language_model.h
+++ b/chromium/components/language/core/browser/baseline_language_model.h
@@ -11,18 +11,10 @@
 #include "components/language/core/browser/language_model.h"
 #include "components/language/core/browser/url_language_histogram.h"
 
-namespace base {
-struct Feature;
-}  // namespace base
-
 class PrefService;
 
 namespace language {
 
-// The feature that enables the baseline language model for translation. If
-// disabled, translate preferences are used instead of a model.
-extern const base::Feature kUseBaselineLanguageModel;
-
 // A language model that attempts to approximate Chrome's legacy behaviour as
 // much as possible.
 //
diff --git a/chromium/components/language/core/browser/heuristic_language_model.cc b/chromium/components/language/core/browser/heuristic_language_model.cc
new file mode 100644
index 00000000000..306cb72a2e6
--- /dev/null
+++ b/chromium/components/language/core/browser/heuristic_language_model.cc
@@ -0,0 +1,262 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/language/core/browser/heuristic_language_model.h"
+
+#include <algorithm>
+#include <unordered_set>
+#include <vector>
+
+#include "base/feature_list.h"
+#include "base/strings/string_split.h"
+#include "components/prefs/pref_service.h"
+
+namespace language {
+
+namespace {
+
+// Input source cutoffs.
+constexpr double kUlpConfidenceCutoff = 0.7;
+constexpr double kUlpProbabilityCutoff = 0.55;
+constexpr float kHistogramFrequencyCutoff = 0.3f;
+
+// Input source weights.
+constexpr float kUiWeight = 2.0f;
+constexpr float kAcceptWeight = 1.1f;
+constexpr float kHistogramWeight = 1.0f;
+constexpr float kUlpWeight = 0.5f;
+constexpr float kScoreDelta = 0.01f;
+
+// For reading ULP prefs.
+constexpr char kUlpConfidenceKey[] = "confidence";
+constexpr char kUlpLanguageKey[] = "language";
+constexpr char kUlpPreferenceKey[] = "preference";
+constexpr char kUlpProbabilityKey[] = "probability";
+constexpr char kUlpReadingKey[] = "reading";
+
+}  // namespace
+
+const base::Feature kUseHeuristicLanguageModel{
+    "UseHeuristicLanguageModel", base::FEATURE_DISABLED_BY_DEFAULT};
+
+bool HasBaseAndRegion(const std::string& lang, std::string* const base) {
+  const std::vector<base::StringPiece> tokens = base::SplitStringPiece(
+      lang, "-", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
+
+  *base = tokens.size() > 0 ? tokens[0].as_string() : "";
+  return tokens.size() > 1 && !tokens[1].empty();
+}
+
+std::vector<std::string> PromoteRegions(
+    const std::vector<std::string>& in_langs) {
+  // Construct a map from base language to the list of region-specific languages
+  // for that base.
+  std::unordered_map<std::string, std::vector<std::string>> regions_by_base;
+  std::string base;
+  for (const std::string& lang : in_langs) {
+    if (HasBaseAndRegion(lang, &base))
+      regions_by_base[base].push_back(lang);
+  }
+
+  // For each input language, output its region-specific variants (if we found
+  // any), or otherwise just the language itself.
+  std::vector<std::string> out_langs;
+  std::unordered_set<std::string> seen;
+  for (const std::string& lang : in_langs) {
+    const auto lookup = regions_by_base.find(lang);
+    const std::vector<std::string>& regions =
+        lookup == regions_by_base.end() ? std::vector<std::string>(1, lang)
+                                        : lookup->second;
+
+    for (const std::string& out_lang : regions) {
+      if (seen.find(out_lang) == seen.end()) {
+        out_langs.push_back(out_lang);
+        seen.insert(out_lang);
+      }
+    }
+  }
+  return out_langs;
+}
+
+std::unordered_map<std::string, float> PromoteRegionScores(
+    const std::unordered_map<std::string, float>& in_scores) {
+  std::unordered_map<std::string, float> out_scores;
+  std::unordered_set<std::string> seen;
+
+  // First pass: add promoted scores for region-specific languges and note base
+  //             languages for which we've observed a region-specific variant.
+  std::string base;
+  for (const auto& kv : in_scores) {
+    const std::string& lang = kv.first;
+    const float score = kv.second;
+
+    if (HasBaseAndRegion(lang, &base)) {
+      seen.insert(lang);
+      seen.insert(base);
+
+      const auto lookup = in_scores.find(base);
+      out_scores[lang] =
+          score + (lookup == in_scores.end() ? 0.0f : lookup->second);
+    }
+  }
+
+  // Second pass: add missing base languages.
+  for (const auto& kv : in_scores) {
+    if (seen.find(kv.first) == seen.end()) {
+      out_scores.insert(kv);
+      seen.insert(kv.first);
+    }
+  }
+
+  return out_scores;
+}
+
+void UpdateLanguageScores(
+    const float score_delta,
+    const float initial_score,
+    const std::vector<std::string>& langs,
+    std::unordered_map<std::string, float>* const scores) {
+  DCHECK(scores);
+
+  float cur_score = initial_score;
+  for (const std::string& lang : langs) {
+    (*scores)[lang] += cur_score;
+    cur_score = std::max(cur_score - score_delta, 0.0f);
+  }
+}
+
+std::vector<LanguageModel::LanguageDetails> ScoresToDetails(
+    const std::unordered_map<std::string, float>& scores) {
+  // Convert map entries into language details.
+  std::vector<LanguageModel::LanguageDetails> details;
+  for (const auto& kv : scores) {
+    details.push_back(LanguageModel::LanguageDetails(kv.first, kv.second));
+  }
+
+  // Sort the details in descending order of score. We impose a total order
+  // (i.e. break score ties by language code comparison) so that the output of
+  // this function is consistent even when two scores are equal.
+  const auto cmp = [](const LanguageModel::LanguageDetails& a,
+                      const LanguageModel::LanguageDetails& b) {
+    return a.score > b.score ||
+           (a.score == b.score && a.lang_code > b.lang_code);
+  };
+  std::sort(details.begin(), details.end(), cmp);
+
+  // If there's no scaling to do, return the list directly.
+  if (details.empty() || details[0].score == 0.0f)
+    return details;
+
+  // Normalize the scores to lie in [0, 1].
+  const float scale = details[0].score;
+  DCHECK(scale != 0.0f);
+  for (LanguageModel::LanguageDetails& detail : details) {
+    detail.score /= scale;
+  }
+
+  return details;
+}
+
+std::vector<LanguageModel::LanguageDetails> MakeHeuristicLanguageList(
+    const float score_delta,
+    const std::vector<std::pair<float, std::vector<std::string>>>& inputs) {
+  std::unordered_map<std::string, float> scores;
+  for (const std::pair<float, std::vector<std::string>>& input : inputs) {
+    UpdateLanguageScores(score_delta, input.first, PromoteRegions(input.second),
+                         &scores);
+  }
+  return ScoresToDetails(PromoteRegionScores(scores));
+}
+
+std::vector<std::string> GetUlpLanguages(
+    const double confidence_cutoff,
+    const double probability_cutoff,
+    const base::DictionaryValue* const dict) {
+  DCHECK(dict);
+
+  std::vector<std::string> langs;
+
+  // If there's no reading list, return an empty list.
+  const base::DictionaryValue* entries = nullptr;
+  if (!dict->GetDictionary(kUlpReadingKey, &entries))
+    return langs;
+
+  // If we have missing or insufficent confidence, return an empty list.
+  double confidence = 0.0;
+  if (!entries->GetDouble(kUlpConfidenceKey, &confidence) ||
+      confidence < confidence_cutoff)
+    return langs;
+
+  // If we have no list of language preferences, return an empty list.
+  const base::ListValue* preference = nullptr;
+  if (!entries->GetList(kUlpPreferenceKey, &preference))
+    return langs;
+
+  // It is assumed that languages appear in descending order of probability.
+  for (const auto& entry : *preference) {
+    const base::DictionaryValue* item = nullptr;
+    std::string language;
+    double probability = 0.0;
+
+    if (!entry.GetAsDictionary(&item) ||
+        !item->GetString(kUlpLanguageKey, &language) ||
+        !item->GetDouble(kUlpProbabilityKey, &probability))
+      continue;
+
+    if (probability < probability_cutoff)
+      break;
+
+    langs.push_back(language);
+  }
+
+  return langs;
+}
+
+std::vector<std::string> GetHistogramLanguages(
+    const float frequency_cutoff,
+    const UrlLanguageHistogram& hist) {
+  std::vector<std::string> langs;
+  for (const auto& info : hist.GetTopLanguages()) {
+    if (info.frequency >= frequency_cutoff)
+      langs.push_back(info.language_code);
+  }
+  return langs;
+}
+
+HeuristicLanguageModel::HeuristicLanguageModel(
+    PrefService* const pref_service,
+    const std::string& ui_lang,
+    const std::string& accept_langs_pref,
+    const std::string& ulp_pref)
+    : pref_service_(pref_service),
+      ui_lang_(ui_lang),
+      accept_langs_pref_(accept_langs_pref),
+      ulp_pref_(ulp_pref),
+      lang_histogram_(pref_service) {
+  DCHECK(pref_service);
+  DCHECK(!ui_lang.empty());
+  DCHECK(!accept_langs_pref.empty());
+  DCHECK(!ulp_pref.empty());
+  DCHECK(pref_service->FindPreference(accept_langs_pref));
+  DCHECK(pref_service->FindPreference(ulp_pref));
+}
+
+HeuristicLanguageModel::~HeuristicLanguageModel() {}
+
+std::vector<LanguageModel::LanguageDetails>
+HeuristicLanguageModel::GetLanguages() {
+  const std::vector<std::pair<float, std::vector<std::string>>> inputs = {
+      {kUiWeight, {ui_lang_}},
+      {kAcceptWeight,
+       base::SplitString(pref_service_->GetString(accept_langs_pref_), ",",
+                         base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)},
+      {kHistogramWeight,
+       GetHistogramLanguages(kHistogramFrequencyCutoff, lang_histogram_)},
+      {kUlpWeight, GetUlpLanguages(kUlpConfidenceCutoff, kUlpProbabilityCutoff,
+                                   pref_service_->GetDictionary(ulp_pref_))},
+  };
+  return MakeHeuristicLanguageList(kScoreDelta, inputs);
+}
+
+}  // namespace language
diff --git a/chromium/components/language/core/browser/heuristic_language_model.h b/chromium/components/language/core/browser/heuristic_language_model.h
new file mode 100644
index 00000000000..916c2524801
--- /dev/null
+++ b/chromium/components/language/core/browser/heuristic_language_model.h
@@ -0,0 +1,137 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_LANGUAGE_CORE_BROWSER_HEURISTIC_LANGUAGE_MODEL_H_
+#define COMPONENTS_LANGUAGE_CORE_BROWSER_HEURISTIC_LANGUAGE_MODEL_H_
+
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "components/language/core/browser/language_model.h"
+#include "components/language/core/browser/url_language_histogram.h"
+
+namespace base {
+struct Feature;
+class DictionaryValue;
+}  // namespace base
+
+class PrefService;
+
+namespace language {
+
+// The feature that enables the heuristic model of user language. If disabled,
+// the baseline model is used instead.
+extern const base::Feature kUseHeuristicLanguageModel;
+
+// A model that heuristically assigns scores to languages that appear in the
+// user's various language lists.
+//
+// First, languages are scored by their rank in the following lists (which are
+// presented in descending order of importance):
+//  1) (Singleton) UI language list
+//  2) Accept language list
+//  3) URL language histogram
+//  4) User Profile's (ULP) "reading list"
+// If a language and its base language (e.g. "en-AU" and "en") both appear in
+// the same input list, the region-specific language is promoted to appear
+// directly above the base language, and the base language is discarded.
+//
+// The language scores are then combined into one output list. The combination
+// process has the following properties:
+//  - A language's scores from each input list are summed.
+//  - If a language and its base language have both been scored, the region-
+//    specific language is assigned the sum of the two scores and the base
+//    language is not included in the model.
+//  - Languages are output in descending order of score, with scores normalized
+//    to lie in [0, 1].
+//
+// NOTE: This model reads the accept language list, URL language histogram and
+//       reading list from user preferences. Hence, these sources must be
+//       registered on the PrefService passed in at construction time.
+class HeuristicLanguageModel : public LanguageModel {
+ public:
+  HeuristicLanguageModel(PrefService* pref_service,
+                         const std::string& ui_lang,
+                         const std::string& accept_langs_pref,
+                         const std::string& ulp_pref);
+  ~HeuristicLanguageModel() override;
+
+  // LanguageModel implementation.
+  std::vector<LanguageDetails> GetLanguages() override;
+
+ private:
+  const PrefService* const pref_service_;
+  const std::string ui_lang_;
+  const std::string accept_langs_pref_;
+  const std::string ulp_pref_;
+  const UrlLanguageHistogram lang_histogram_;
+};
+
+// The following functions are exposed for testing only.
+
+// Given a language code |lang|, returns true if |lang| includes a
+// region-specific subcode (e.g. "en-AU"). Sets |base| to the base subcode (e.g.
+// "en") of |lang| if it can be extracted, or the empty string otherwise.
+bool HasBaseAndRegion(const std::string& lang, std::string* base);
+
+// Accepts a list |in_langs| of language codes, and returns a copy that includes
+// the following modifications:
+//  - If any region-specific code (e.g. "en-AU") appears after its base (e.g.
+//    "en") the list, it is moved directly in front of the base code. Multiple
+//    such region-specific codes will all be promoted, and their relative
+//    ordering will be preserved.
+//  - If the list contains both a region-specific code and its base, the base is
+//    removed.
+std::vector<std::string> PromoteRegions(
+    const std::vector<std::string>& in_langs);
+
+// Accepts a map |in_scores| of language codes to scores, and returns a copy
+// that includes the following modifications:
+//  - The score for each region-specific code (e.g. "en-AU") is incremented by
+//    the score of its base code (e.g. "en") if it is also present in the map.
+//  - If the map contains both a region-specific code and its base, the base is
+//    removed.
+std::unordered_map<std::string, float> PromoteRegionScores(
+    const std::unordered_map<std::string, float>& in_scores);
+
+// Given an existing map |scores| of language codes to scores, and an list
+// |langs| of input codes, increments the score of each input code by
+//     |initial_score| - r * |score_delta|
+// (if this value is positive), where r is the rank of the code in the input
+// list.
+void UpdateLanguageScores(float score_delta,
+                          float initial_score,
+                          const std::vector<std::string>& langs,
+                          std::unordered_map<std::string, float>* scores);
+
+// Converts a map |scores| of (language code, scores) pairs into a list of
+// |LanguageDetails|, with entries ordered by descending score and linearly
+// scaled such that the first (non-zero) entry has score 1.0.
+std::vector<LanguageModel::LanguageDetails> ScoresToDetails(
+    const std::unordered_map<std::string, float>& scores);
+
+// Constructs a heuristically-scored language list from a vector |inputs| of
+// (language source, source weight) pairs and a rank penalty |score_delta|.
+std::vector<LanguageModel::LanguageDetails> MakeHeuristicLanguageList(
+    float score_delta,
+    const std::vector<std::pair<float, std::vector<std::string>>>& inputs);
+
+// Outputs language codes from the ULP "reading list" stored in |dict|. If a
+// given language has probability less than |probability_cutoff| it is not
+// included, and no languages are included if the reading list has confidence
+// less than |confidence_cutoff|.
+std::vector<std::string> GetUlpLanguages(double confidence_cutoff,
+                                         double probability_cutoff,
+                                         const base::DictionaryValue* dict);
+
+// Returns the list of language codes in |hist| with frequency no less than
+// |frequency_cutoff|.
+std::vector<std::string> GetHistogramLanguages(
+    float frequency_cutoff,
+    const UrlLanguageHistogram& hist);
+
+}  // namespace language
+
+#endif  // COMPONENTS_LANGUAGE_CORE_BROWSER_HEURISTIC_LANGUAGE_MODEL_H_
diff --git a/chromium/components/language/core/browser/heuristic_language_model_unittest.cc b/chromium/components/language/core/browser/heuristic_language_model_unittest.cc
new file mode 100644
index 00000000000..683567598cc
--- /dev/null
+++ b/chromium/components/language/core/browser/heuristic_language_model_unittest.cc
@@ -0,0 +1,458 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/language/core/browser/heuristic_language_model.h"
+
+#include <cmath>
+
+#include "base/json/json_reader.h"
+#include "base/macros.h"
+#include "base/values.h"
+#include "components/language/core/browser/url_language_histogram.h"
+#include "components/prefs/pref_registry_simple.h"
+#include "components/prefs/testing_pref_service.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace language {
+
+using testing::ElementsAre;
+using testing::Eq;
+using testing::IsEmpty;
+using testing::UnorderedElementsAre;
+
+using LangScoreMap = std::unordered_map<std::string, float>;
+using Ld = LanguageModel::LanguageDetails;
+
+// Compares LanguageDetails.
+MATCHER_P(EqualsLd, lang_details, "") {
+  const float float_eps = 0.00001f;
+  return arg.lang_code == lang_details.lang_code &&
+         std::abs(arg.score - lang_details.score) < float_eps;
+}
+
+// HasBaseAndRegion tests.
+
+// Empty string.
+TEST(HasBaseAndRegionTest, Empty) {
+  std::string base;
+  EXPECT_THAT(HasBaseAndRegion("", &base), Eq(false));
+  EXPECT_THAT(base, Eq(""));
+}
+
+// Two and three char base language codes.
+TEST(HasBaseAndRegionTest, BaseOnly) {
+  std::string base;
+  EXPECT_THAT(HasBaseAndRegion("it", &base), Eq(false));
+  EXPECT_THAT(base, Eq("it"));
+  EXPECT_THAT(HasBaseAndRegion("haw", &base), Eq(false));
+  EXPECT_THAT(base, Eq("haw"));
+}
+
+// Two and three char language codes with region tags.
+TEST(HasBaseAndRegionTest, BaseAndRegion) {
+  std::string base;
+  EXPECT_THAT(HasBaseAndRegion("en-AU", &base), Eq(true));
+  EXPECT_THAT(base, Eq("en"));
+  EXPECT_THAT(HasBaseAndRegion("yue-HK", &base), Eq(true));
+  EXPECT_THAT(base, Eq("yue"));
+}
+
+// Malformed input.
+TEST(HasBaseAndRegionTest, Malformed) {
+  std::string base;
+  EXPECT_THAT(HasBaseAndRegion("-", &base), Eq(false));
+  EXPECT_THAT(base, Eq(""));
+  EXPECT_THAT(HasBaseAndRegion("it-", &base), Eq(false));
+  EXPECT_THAT(base, Eq("it"));
+  EXPECT_THAT(HasBaseAndRegion("yue--", &base), Eq(false));
+  EXPECT_THAT(base, Eq("yue"));
+  EXPECT_THAT(HasBaseAndRegion("es--AR", &base), Eq(true));
+  EXPECT_THAT(base, Eq("es"));
+}
+
+// PromoteRegion tests.
+
+// Basic tests without region-specific languages.
+TEST(PromoteRegionsTest, NoRegions) {
+  EXPECT_THAT(PromoteRegions({}), IsEmpty());
+  EXPECT_THAT(PromoteRegions({"it"}), ElementsAre("it"));
+  EXPECT_THAT(PromoteRegions({"en", "fr", "it"}),
+              ElementsAre("en", "fr", "it"));
+}
+
+// Test a single region for a single language.
+TEST(PromoteRegionsTest, SingleRegion) {
+  EXPECT_THAT(PromoteRegions({"en-AU"}), ElementsAre("en-AU"));
+  EXPECT_THAT(PromoteRegions({"en-AU", "en"}), ElementsAre("en-AU"));
+  EXPECT_THAT(PromoteRegions({"en", "en-AU"}), ElementsAre("en-AU"));
+}
+
+// Test multiple regions for a single language.
+TEST(PromoteRegionsTest, MultipleRegions) {
+  EXPECT_THAT(PromoteRegions({"en-AU", "en-US"}),
+              ElementsAre("en-AU", "en-US"));
+  EXPECT_THAT(PromoteRegions({"en-AU", "en-US", "en"}),
+              ElementsAre("en-AU", "en-US"));
+  EXPECT_THAT(PromoteRegions({"en", "en-AU", "en-US"}),
+              ElementsAre("en-AU", "en-US"));
+}
+
+// Test multiple regions for multiple languages.
+TEST(PromoteRegionsTest, MultipleBases) {
+  EXPECT_THAT(PromoteRegions({"en-AU", "fr-FR", "en-US", "fr-CA"}),
+              ElementsAre("en-AU", "fr-FR", "en-US", "fr-CA"));
+  EXPECT_THAT(PromoteRegions({"en-AU", "en-US", "fr", "en"}),
+              ElementsAre("en-AU", "en-US", "fr"));
+  EXPECT_THAT(PromoteRegions({"fr", "en", "fr-FR", "fr-CA", "en-AU", "en-US"}),
+              ElementsAre("fr-FR", "fr-CA", "en-AU", "en-US"));
+}
+
+// PromoteRegionScores tests.
+
+// Basic tests without region-specific languages.
+TEST(PromoteRegionScoresTest, NoRegions) {
+  EXPECT_THAT(PromoteRegionScores({}), IsEmpty());
+  EXPECT_THAT(PromoteRegionScores({{"it", 1.0f}}),
+              Eq(LangScoreMap({{"it", 1.0f}})));
+  EXPECT_THAT(PromoteRegionScores({{"en", 1.0f}, {"fr", 0.5f}, {"it", 0.25f}}),
+              Eq(LangScoreMap({{"en", 1.0f}, {"fr", 0.5f}, {"it", 0.25f}})));
+}
+
+// Test a single region for a single language.
+TEST(PromoteRegionScores, SingleRegion) {
+  EXPECT_THAT(PromoteRegionScores({{"en-AU", 1.0f}}),
+              Eq(LangScoreMap({{"en-AU", 1.0f}})));
+  EXPECT_THAT(PromoteRegionScores({{"en-AU", 1.0f}, {"en", 0.5f}}),
+              Eq(LangScoreMap({{"en-AU", 1.5f}})));
+}
+
+// Test multiple regions for a single language.
+TEST(PromoteRegionScores, MultipleRegions) {
+  EXPECT_THAT(PromoteRegionScores({{"en-AU", 1.0f}, {"en-US", 0.5f}}),
+              Eq(LangScoreMap({{"en-AU", 1.0f}, {"en-US", 0.5f}})));
+  EXPECT_THAT(
+      PromoteRegionScores({{"en-AU", 1.0f}, {"en-US", 0.5f}, {"en", 0.25f}}),
+      Eq(LangScoreMap({{"en-AU", 1.25f}, {"en-US", 0.75f}})));
+}
+
+// Test multiple regions for multiple languages.
+TEST(PromoteRegionScoresTest, MultipleBases) {
+  EXPECT_THAT(PromoteRegionScores({{"en-AU", 1.0f},
+                                   {"fr-FR", 0.5f},
+                                   {"en-US", 0.25f},
+                                   {"fr-CA", 0.125f}}),
+              Eq(LangScoreMap({{"en-AU", 1.0f},
+                               {"fr-FR", 0.5f},
+                               {"en-US", 0.25f},
+                               {"fr-CA", 0.125f}})));
+
+  EXPECT_THAT(
+      PromoteRegionScores(
+          {{"en-AU", 1.0f}, {"en-US", 0.5f}, {"en", 0.25f}, {"fr", 0.125f}}),
+      Eq(LangScoreMap({{"en-AU", 1.25f}, {"en-US", 0.75f}, {"fr", 0.125f}})));
+
+  EXPECT_THAT(PromoteRegionScores({{"fr", 1.0f},
+                                   {"en", 0.9f},
+                                   {"fr-FR", 0.8f},
+                                   {"fr-CA", 0.7f},
+                                   {"en-AU", 0.6f},
+                                   {"en-US", 0.5f}}),
+              Eq(LangScoreMap({{"fr-FR", 1.8f},
+                               {"fr-CA", 1.7f},
+                               {"en-AU", 1.5f},
+                               {"en-US", 1.4f}})));
+}
+
+// UpdateLanguageScores tests.
+// Note that these favor "round" numbers to make the floating point calculation
+// exact.
+
+// Test that nothing is output when combining empty maps.
+TEST(UpdateLanguageScoresTest, EmptyCombination) {
+  LangScoreMap out;
+  UpdateLanguageScores(0.1f, 1.0f, {}, &out);
+  UpdateLanguageScores(0.1f, 1.0f, {}, &out);
+  EXPECT_THAT(out, IsEmpty());
+}
+
+// Test standard usage.
+TEST(UpdateLanguageScoresTest, NonEmptyCombination) {
+  const std::vector<std::string> in1 = {"en", "it", "zh"},
+                                 in2 = {"it", "en", "fr"};
+  LangScoreMap out;
+
+  UpdateLanguageScores(0.25f, 1.00f, in1, &out);
+  UpdateLanguageScores(0.25f, 0.75f, in2, &out);
+
+  EXPECT_THAT(out,
+              Eq(LangScoreMap(
+                  {{"en", 1.5f}, {"it", 1.5f}, {"zh", 0.5f}, {"fr", 0.25f}})));
+}
+
+// Test with high enough delta that some entries are scored 0.
+TEST(UpdateLanguageScoresTest, MaxPenalty) {
+  const std::vector<std::string> in1 = {"en", "it", "zh"},
+                                 in2 = {"it", "en", "fr"};
+  LangScoreMap out;
+
+  UpdateLanguageScores(0.75f, 1.0f, in1, &out);
+  UpdateLanguageScores(0.50f, 0.5f, in2, &out);
+
+  EXPECT_THAT(out,
+              Eq(LangScoreMap(
+                  {{"en", 1.0f}, {"it", 0.75f}, {"zh", 0.0f}, {"fr", 0.0f}})));
+}
+
+// ScoresToDetails tests.
+
+// Test empty input map.
+TEST(ScoresToDetailsTest, Empty) {
+  EXPECT_THAT(ScoresToDetails({}), IsEmpty());
+}
+
+// Test single entry.
+TEST(ScoresToDetailsTest, Singleton) {
+  EXPECT_THAT(ScoresToDetails({{"en", 1.0f}}),
+              ElementsAre(EqualsLd(Ld("en", 1.0f))));
+  EXPECT_THAT(ScoresToDetails({{"en", 0.5f}}),
+              ElementsAre(EqualsLd(Ld("en", 1.0f))));
+  EXPECT_THAT(ScoresToDetails({{"en", 0.0f}}),
+              ElementsAre(EqualsLd(Ld("en", 0.0f))));
+}
+
+// Test multiple entries.
+TEST(ScoresToDetailsTest, MultipleEntries) {
+  EXPECT_THAT(ScoresToDetails({{"it", 0.5f}, {"zh", 1.0f}, {"en", 2.0f}}),
+              ElementsAre(EqualsLd(Ld("en", 1.0f)), EqualsLd(Ld("zh", 0.5f)),
+                          EqualsLd(Ld("it", 0.25f))));
+
+  EXPECT_THAT(ScoresToDetails({{"it", 0.5f}, {"en", 0.5f}}),
+              ElementsAre(EqualsLd(Ld("it", 1.0f)), EqualsLd(Ld("en", 1.0f))));
+
+  EXPECT_THAT(ScoresToDetails({{"en", 0.0f}, {"it", 0.0f}}),
+              ElementsAre(EqualsLd(Ld("it", 0.0f)), EqualsLd(Ld("en", 0.0f))));
+}
+
+// MakeHeuristicLanguageList tests.
+
+// Using a fixed weight set, construct a test model for the given input.
+std::vector<LanguageModel::LanguageDetails> TestModel(
+    const std::vector<std::vector<std::string>>& input_langs) {
+  const float delta = 0.01f;
+  const float weights[] = {2.0f, 1.1f, 1.0f, 0.5f};
+  CHECK_EQ(arraysize(weights), input_langs.size());
+
+  // Construct input to model.
+  std::vector<std::pair<float, std::vector<std::string>>> input;
+  for (unsigned long i = 0; i < arraysize(weights); ++i)
+    input.push_back({weights[i], input_langs[i]});
+
+  // Construct model itself.
+  return MakeHeuristicLanguageList(delta, input);
+}
+
+// Using a fixed weight set, construct a test model for the given input and
+// return the order of languages in this model.
+std::vector<std::string> TestModelOrdering(
+    const std::vector<std::vector<std::string>>& input_langs) {
+  std::vector<std::string> output_langs;
+  for (const auto& details : TestModel(input_langs))
+    output_langs.push_back(details.lang_code);
+  return output_langs;
+}
+
+// Test the model ordering for a set of hand-calculated examples.
+TEST(MakeHeuristicLanguageListTest, Ordering) {
+  // UI / accept only.
+  EXPECT_THAT(TestModelOrdering({{"en"}, {"en"}, {}, {}}), ElementsAre("en"));
+
+  // UI overrides accept.
+  EXPECT_THAT(TestModelOrdering({{"en"}, {"fr"}, {}, {}}),
+              ElementsAre("en", "fr"));
+
+  // History + accept overrides UI.
+  EXPECT_THAT(TestModelOrdering({{"en"}, {"fr"}, {"fr"}, {}}),
+              ElementsAre("fr", "en"));
+
+  // Accept overrides history.
+  EXPECT_THAT(TestModelOrdering({{"en"}, {"es"}, {"fr"}, {}}),
+              ElementsAre("en", "es", "fr"));
+
+  // History + ULP overrides accept.
+  EXPECT_THAT(TestModelOrdering({{"en"}, {"es"}, {"fr"}, {"fr"}}),
+              ElementsAre("en", "fr", "es"));
+
+  // Accept overrides history.
+  EXPECT_THAT(TestModelOrdering({{"en"}, {"es-MX"}, {"fr"}, {}}),
+              ElementsAre("en", "es-MX", "fr"));
+
+  // Correctly handle regions.
+  EXPECT_THAT(TestModelOrdering({{"en"}, {"fr", "en-US"}, {}, {}}),
+              ElementsAre("en-US", "fr"));
+
+  // Region-specific overriding UI.
+  EXPECT_THAT(
+      TestModelOrdering({{"fr"}, {"en", "en-CA", "en-US"}, {"en"}, {"en-US"}}),
+      ElementsAre("en-US", "en-CA", "fr"));
+}
+
+// Test the scores of one hand-calculated example.
+TEST(MakeHeuristicLanguageListTest, Scores) {
+  EXPECT_THAT(TestModel({{"fr"}, {"en", "en-CA", "en-US"}, {"en"}, {"en-US"}}),
+              ElementsAre(EqualsLd(Ld("en-US", 1.0f)),
+                          EqualsLd(Ld("en-CA", 2.1f / 2.59f)),
+                          EqualsLd(Ld("fr", 2.0f / 2.59f))));
+}
+
+// GetHistogramLanguages tests.
+
+// Test an empty language histogram.
+TEST(GetHistogramLanguagesTest, Empty) {
+  TestingPrefServiceSimple prefs;
+  UrlLanguageHistogram::RegisterProfilePrefs(prefs.registry());
+  UrlLanguageHistogram hist(&prefs);
+  EXPECT_THAT(GetHistogramLanguages(0.0f, hist), IsEmpty());
+}
+
+// Test that the frequency cutoff is applied correctly.
+TEST(GetHistogramLanguagesTest, FrequencyCutoff) {
+  TestingPrefServiceSimple prefs;
+  UrlLanguageHistogram::RegisterProfilePrefs(prefs.registry());
+  UrlLanguageHistogram hist(&prefs);
+
+  // Visit sites with languages in a 3 : 2 : 1 ratio.
+  for (int i = 0; i < 30; ++i) {
+    hist.OnPageVisited("en");
+    hist.OnPageVisited("en");
+    hist.OnPageVisited("en");
+    hist.OnPageVisited("it");
+    hist.OnPageVisited("it");
+    hist.OnPageVisited("zh");
+  }
+
+  EXPECT_THAT(GetHistogramLanguages(0.0f, hist), ElementsAre("en", "it", "zh"));
+  EXPECT_THAT(GetHistogramLanguages(1.0f / 3, hist), ElementsAre("en", "it"));
+  EXPECT_THAT(GetHistogramLanguages(1.0f / 2, hist), ElementsAre("en"));
+}
+
+// GetUlpLanguages tests.
+
+// Test with no ULP languages.
+TEST(GetUlpLanguagesTest, Empty) {
+  const auto dict = base::DictionaryValue::From(base::JSONReader::Read(R"({
+    "reading": {
+      "confidence": 1.0,
+      "preference": []
+    }
+  })"));
+
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.0, dict.get()), IsEmpty());
+}
+
+// Test that ULP profile of insufficient confidence is ignored.
+TEST(GetUlpLanguagesTest, ConfidenceCutoff) {
+  const auto dict = base::DictionaryValue::From(base::JSONReader::Read(R"({
+    "reading": {
+      "confidence": 0.5,
+      "preference": [{"language": "en", "probability": 1.0}]
+    }
+  })"));
+
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.0, dict.get()), ElementsAre("en"));
+  EXPECT_THAT(GetUlpLanguages(0.5, 0.0, dict.get()), ElementsAre("en"));
+  EXPECT_THAT(GetUlpLanguages(0.501, 0.0, dict.get()), IsEmpty());
+}
+
+// Test that ULP languages of insufficient probability are ignored.
+TEST(GetUlpLanguagesTest, ProbabilityCutoff) {
+  const auto dict = base::DictionaryValue::From(base::JSONReader::Read(R"({
+    "reading": {
+      "confidence": 1.0,
+      "preference": [{"language": "en", "probability": 1.00},
+                     {"language": "it", "probability": 0.50},
+                     {"language": "zh", "probability": 0.25}]
+    }
+  })"));
+
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.0, dict.get()),
+              ElementsAre("en", "it", "zh"));
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.25, dict.get()),
+              ElementsAre("en", "it", "zh"));
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.2501, dict.get()),
+              ElementsAre("en", "it"));
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.5, dict.get()), ElementsAre("en", "it"));
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.501, dict.get()), ElementsAre("en"));
+  EXPECT_THAT(GetUlpLanguages(0.0, 1.0, dict.get()), ElementsAre("en"));
+}
+
+// Test that malformed ULP data is handled gracefully.
+TEST(GetUlpLanguagesTest, Malformed) {
+  const auto empty = base::DictionaryValue::From(base::JSONReader::Read("{}"));
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.0, empty.get()), IsEmpty());
+
+  const auto conf = base::DictionaryValue::From(base::JSONReader::Read(R"({
+    "reading": {
+      "preference": [{"language": "en", "probability": 1.00}]
+    }
+  })"));
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.0, conf.get()), IsEmpty());
+
+  const auto no_prefs = base::DictionaryValue::From(base::JSONReader::Read(R"({
+    "reading": {
+      "confidence": 1.0
+    }
+  })"));
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.0, no_prefs.get()), IsEmpty());
+
+  const auto bad_prefs = base::DictionaryValue::From(base::JSONReader::Read(R"({
+    "reading": {
+      "confidence": 1.0,
+      "preference": [{"language": "en"}, {"probability": 1.0},
+                     {"language": "it", "probability": 1.0}]
+    }
+  })"));
+  EXPECT_THAT(GetUlpLanguages(0.0, 0.0, bad_prefs.get()), ElementsAre("it"));
+}
+
+// "Integration"-style test that loads inputs into preferences then calls the
+// model object. This test relies on the values of constants (e.g. weights) in
+// the model definition, so must be updated every time these are tweaked.
+
+TEST(HeuristicLanguageModelTest, PrefReading) {
+  const char accept_pref[] = "intl.accept_languages";
+  const char ulp_pref[] = "language_profile";
+
+  TestingPrefServiceSimple prefs;
+  PrefRegistrySimple* const registry = prefs.registry();
+
+  // Set up accept languages.
+  registry->RegisterStringPref(accept_pref, std::string());
+  prefs.SetString(accept_pref, "en,en-CA,en-US");
+
+  // Visit enough English pages to get an "en" entry in the histogram.
+  UrlLanguageHistogram::RegisterProfilePrefs(registry);
+  UrlLanguageHistogram hist(&prefs);
+  for (int i = 0; i < 30; ++i)
+    hist.OnPageVisited("en");
+
+  // Set up ULP languages.
+  registry->RegisterDictionaryPref(ulp_pref);
+  const auto ulp_value = base::DictionaryValue::From(base::JSONReader::Read(R"({
+    "reading": {
+      "confidence": 1.0,
+      "preference": [{"language": "en-US", "probability": 1.0}]
+    }
+  })"));
+  prefs.Set(ulp_pref, *ulp_value);
+
+  // Construct and query model.
+  HeuristicLanguageModel model(&prefs, "fr", accept_pref, ulp_pref);
+  EXPECT_THAT(model.GetLanguages(),
+              ElementsAre(EqualsLd(Ld("en-US", 1.0f)),
+                          EqualsLd(Ld("en-CA", 2.1f / 2.59f)),
+                          EqualsLd(Ld("fr", 2.0f / 2.59f))));
+}
+
+}  // namespace language
diff --git a/chromium/components/language/core/browser/pref_names.cc b/chromium/components/language/core/browser/pref_names.cc
new file mode 100644
index 00000000000..0a7fb76de87
--- /dev/null
+++ b/chromium/components/language/core/browser/pref_names.cc
@@ -0,0 +1,16 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/language/core/browser/pref_names.h"
+
+namespace language {
+namespace prefs {
+
+// The JSON representation of the user's language profile. Used as an input to
+// the user language model (i.e. for determining which languages a user
+// understands).
+const char kUserLanguageProfile[] = "language_profile";
+
+}  // namespace prefs
+}  // namespace language
diff --git a/chromium/components/language/core/browser/pref_names.h b/chromium/components/language/core/browser/pref_names.h
new file mode 100644
index 00000000000..629b4161f59
--- /dev/null
+++ b/chromium/components/language/core/browser/pref_names.h
@@ -0,0 +1,17 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_LANGUAGE_CORE_BROWSER_PREF_NAMES_H_
+#define COMPONENTS_LANGUAGE_CORE_BROWSER_PREF_NAMES_H_
+
+namespace language {
+namespace prefs {
+
+// TODO(martis): Add accept language preference here.
+extern const char kUserLanguageProfile[];
+
+}  // namespace prefs
+}  // namespace language
+
+#endif  // COMPONENTS_LANGUAGE_CORE_BROWSER_PREF_NAMES_H_
diff --git a/chromium/components/language/ios/browser/BUILD.gn b/chromium/components/language/ios/browser/BUILD.gn
new file mode 100644
index 00000000000..5d477d0b015
--- /dev/null
+++ b/chromium/components/language/ios/browser/BUILD.gn
@@ -0,0 +1,19 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("browser") {
+  configs += [ "//build/config/compiler:enable_arc" ]
+  sources = [
+    "ios_language_detection_tab_helper.h",
+    "ios_language_detection_tab_helper.mm",
+  ]
+
+  deps = [
+    "//base",
+    "//components/language/core/browser",
+    "//components/translate/core/common",
+    "//ios/web",
+    "//net",
+  ]
+}
diff --git a/chromium/components/language/ios/browser/DEPS b/chromium/components/language/ios/browser/DEPS
new file mode 100644
index 00000000000..2955de77132
--- /dev/null
+++ b/chromium/components/language/ios/browser/DEPS
@@ -0,0 +1,3 @@
+include_rules = [
+  "+components/translate/core/common",
+]
diff --git a/chromium/components/language/ios/browser/ios_language_detection_tab_helper.h b/chromium/components/language/ios/browser/ios_language_detection_tab_helper.h
new file mode 100644
index 00000000000..9e04a1cca28
--- /dev/null
+++ b/chromium/components/language/ios/browser/ios_language_detection_tab_helper.h
@@ -0,0 +1,58 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_LANUGUAGE_IOS_BROWSER_IOS_LANGUAGE_DETECTION_TAB_HELPER_H_
+#define COMPONENTS_LANUGUAGE_IOS_BROWSER_IOS_LANGUAGE_DETECTION_TAB_HELPER_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "ios/web/public/web_state/web_state_user_data.h"
+
+namespace translate {
+struct LanguageDetectionDetails;
+}  // namespace translate
+
+namespace language {
+
+class UrlLanguageHistogram;
+
+// Dispatches language detection messages to language and translate components.
+class IOSLanguageDetectionTabHelper
+    : public web::WebStateUserData<IOSLanguageDetectionTabHelper> {
+ public:
+  using Callback =
+      base::RepeatingCallback<void(const translate::LanguageDetectionDetails&)>;
+
+  ~IOSLanguageDetectionTabHelper() override;
+
+  // Attach a new helper to the given WebState. We cannot use the implementation
+  // from WebStateUserData as we are injecting the histogram and translate
+  // callback differently on iOS and iOS WebView.
+  static void CreateForWebState(web::WebState* web_state,
+                                const Callback& translate_callback,
+                                UrlLanguageHistogram* url_language_histogram);
+
+  // Called on page language detection.
+  void OnLanguageDetermined(const translate::LanguageDetectionDetails& details);
+
+  // Add an extra listener for language detection. May only be used in tests.
+  void SetExtraCallbackForTesting(const Callback& callback);
+
+ private:
+  IOSLanguageDetectionTabHelper(
+      const Callback& translate_callback,
+      UrlLanguageHistogram* const url_language_histogram);
+  friend class web::WebStateUserData<IOSLanguageDetectionTabHelper>;
+
+  const Callback translate_callback_;
+  UrlLanguageHistogram* const url_language_histogram_;
+
+  Callback extra_callback_for_testing_;
+
+  DISALLOW_COPY_AND_ASSIGN(IOSLanguageDetectionTabHelper);
+};
+
+}  // namespace language
+
+#endif  // COMPONENTS_LANUGUAGE_IOS_BROWSER_IOS_LANGUAGE_DETECTION_TAB_HELPER_H_
diff --git a/chromium/components/language/ios/browser/ios_language_detection_tab_helper.mm b/chromium/components/language/ios/browser/ios_language_detection_tab_helper.mm
new file mode 100644
index 00000000000..8781ad10f9f
--- /dev/null
+++ b/chromium/components/language/ios/browser/ios_language_detection_tab_helper.mm
@@ -0,0 +1,56 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/language/ios/browser/ios_language_detection_tab_helper.h"
+
+#include "components/language/core/browser/url_language_histogram.h"
+#include "components/translate/core/common/language_detection_details.h"
+
+DEFINE_WEB_STATE_USER_DATA_KEY(language::IOSLanguageDetectionTabHelper);
+
+namespace language {
+
+IOSLanguageDetectionTabHelper::IOSLanguageDetectionTabHelper(
+    const Callback& translate_callback,
+    UrlLanguageHistogram* const url_language_histogram)
+    : translate_callback_(translate_callback),
+      url_language_histogram_(url_language_histogram) {}
+
+IOSLanguageDetectionTabHelper::~IOSLanguageDetectionTabHelper() = default;
+
+// static
+void IOSLanguageDetectionTabHelper::CreateForWebState(
+    web::WebState* web_state,
+    const Callback& translate_callback,
+    UrlLanguageHistogram* const url_language_histogram) {
+  DCHECK(web_state);
+  if (!FromWebState(web_state)) {
+    web_state->SetUserData(UserDataKey(),
+                           base::WrapUnique(new IOSLanguageDetectionTabHelper(
+                               translate_callback, url_language_histogram)));
+  }
+}
+
+void IOSLanguageDetectionTabHelper::OnLanguageDetermined(
+    const translate::LanguageDetectionDetails& details) {
+  // Update language histogram.
+  if (url_language_histogram_ && details.is_cld_reliable) {
+    url_language_histogram_->OnPageVisited(details.cld_language);
+  }
+
+  // Update translate.
+  translate_callback_.Run(details);
+
+  // Optionally update testing callback.
+  if (extra_callback_for_testing_) {
+    extra_callback_for_testing_.Run(details);
+  }
+}
+
+void IOSLanguageDetectionTabHelper::SetExtraCallbackForTesting(
+    const Callback& callback) {
+  extra_callback_for_testing_ = callback;
+}
+
+}  // namespace language
diff --git a/chromium/components/language/language_code_locator.cc b/chromium/components/language/language_code_locator.cc
new file mode 100644
index 00000000000..bb06734cc18
--- /dev/null
+++ b/chromium/components/language/language_code_locator.cc
@@ -0,0 +1,37 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/language/language_code_locator.h"
+
+#include "base/strings/string_split.h"
+#include "third_party/s2cellid/src/s2/s2cellid.h"
+#include "third_party/s2cellid/src/s2/s2latlng.h"
+
+namespace language {
+namespace internal {
+extern std::vector<std::pair<uint64_t, std::string>>
+GenerateDistrictLanguageMapping();
+}  // namespace internal
+
+LanguageCodeLocator::LanguageCodeLocator()
+    : district_languages_(internal::GenerateDistrictLanguageMapping()) {}
+
+LanguageCodeLocator::~LanguageCodeLocator() {}
+
+std::vector<std::string> LanguageCodeLocator::GetLanguageCode(
+    double latitude,
+    double longitude) const {
+  S2CellId current_cell(S2LatLng::FromDegrees(latitude, longitude));
+  while (current_cell.level() > 0) {
+    auto search = district_languages_.find(current_cell.id());
+    if (search != district_languages_.end()) {
+      return base::SplitString(search->second, ";", base::KEEP_WHITESPACE,
+                               base::SPLIT_WANT_ALL);
+    }
+    current_cell = current_cell.parent();
+  }
+  return {};
+}
+
+}  // namespace language
diff --git a/chromium/components/language/language_code_locator.h b/chromium/components/language/language_code_locator.h
new file mode 100644
index 00000000000..3cc9ac66867
--- /dev/null
+++ b/chromium/components/language/language_code_locator.h
@@ -0,0 +1,35 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_LANGUAGE_LANGUAGE_CODE_LOCATOR_H_
+#define COMPONENTS_LANGUAGE_LANGUAGE_CODE_LOCATOR_H_
+
+#include <string>
+#include <vector>
+
+#include "base/containers/flat_map.h"
+#include "base/macros.h"
+
+namespace language {
+
+class LanguageCodeLocator {
+ public:
+  LanguageCodeLocator();
+  ~LanguageCodeLocator();
+
+  // Find the language code given a coordinate.
+  // If the latitude, longitude pair is not found, will return an empty vector.
+  std::vector<std::string> GetLanguageCode(double latitude,
+                                           double longitude) const;
+
+ private:
+  // Map from s2 cellid to ';' delimited list of language codes.
+  const base::flat_map<uint64_t, std::string> district_languages_;
+
+  DISALLOW_COPY_AND_ASSIGN(LanguageCodeLocator);
+};
+
+}  // namespace language
+
+#endif  // COMPONENTS_LANGUAGE_LANGUAGE_CODE_LOCATOR_H_
diff --git a/chromium/components/language/language_code_locator_unittest.cc b/chromium/components/language/language_code_locator_unittest.cc
new file mode 100644
index 00000000000..2553353c5ec
--- /dev/null
+++ b/chromium/components/language/language_code_locator_unittest.cc
@@ -0,0 +1,31 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/language/language_code_locator.h"
+
+#include <string>
+#include <vector>
+
+#include "base/logging.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace language {
+
+TEST(LanguageCodeLocatorTest, LocatedLanguage) {
+  LanguageCodeLocator locator;
+  std::vector<std::string> expected_langs = {"hi", "mr", "ur"};
+  // Random place in Madhya Pradesh, expected langs should be hi;mr;ur.
+  const auto& result = locator.GetLanguageCode(23.0, 80.0);
+  EXPECT_EQ(expected_langs, result);
+}
+
+TEST(LanguageCodeLocatorTest, NotFoundLanguage) {
+  LanguageCodeLocator locator;
+  std::vector<std::string> expected_langs = {};
+  // Random place outside India.
+  const auto& result = locator.GetLanguageCode(10.0, 10.0);
+  EXPECT_EQ(expected_langs, result);
+}
+
+}  // namespace language
diff --git a/chromium/components/language/template/language_code_locator_helper.cc.tmpl b/chromium/components/language/template/language_code_locator_helper.cc.tmpl
new file mode 100644
index 00000000000..9c36aa89ee6
--- /dev/null
+++ b/chromium/components/language/template/language_code_locator_helper.cc.tmpl
@@ -0,0 +1,22 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <string>
+#include <vector>
+
+namespace language {
+namespace internal {
+std::vector<std::pair<uint64_t, std::string>>
+GenerateDistrictLanguageMapping() {
+  return {
+  {% set c = 1 %}
+  {% for cell_lang_pair in cell_lang_pairs -%}
+    { {{cell_lang_pair[0]}}ull, "{{cell_lang_pair[1]}}"}{% if c < cell_lang_pairs|length%},{% endif %}
+    {% set c = c + 1%}
+  {%- endfor %}
+  };
+}
+
+}  // namespace internal
+}  // namespace language