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diff --git a/chromium/components/machine_intelligence/proto/translate_ranker_model.proto b/chromium/components/machine_intelligence/proto/translate_ranker_model.proto
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+// Copyright (c) 2016 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.
+//
+// Experimental Translation Assist Model to allow/suppress translation prompts.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package machine_intelligence;
+
+// Defines a Chrome Ranker Translate Model.
+// Next tag: 13
+message TranslateRankerModel {
+  // A number that identifies the version of this model.
+  optional uint32 version = 1;
+
+  // Defines the weights and bias of a Logistic Regression Model.
+  message LogisticRegressionModel {
+    // Decision threshold. If not defined, use 0.5.
+    optional float threshold = 12;
+
+    optional float bias = 1;
+
+    optional float accept_ratio_weight = 2;
+    optional float decline_ratio_weight = 3;
+    optional float ignore_ratio_weight = 4;
+
+    optional float accept_count_weight = 9;
+    optional float decline_count_weight = 10;
+    optional float ignore_count_weight = 11;
+
+    // One-hot features are encoded in the form of a map. These maps
+    // each contain an element 'UNKNOWN' to use in case the key is not
+    // found in the map.
+    map<string, float> source_language_weight = 5;
+    map<string, float> target_language_weight = 6;
+    map<string, float> country_weight = 7;
+    map<string, float> locale_weight = 8;
+  }
+
+  oneof model_revision {
+    LogisticRegressionModel logistic_regression_model = 2;
+  }
+}