1 files changed, 75 insertions, 0 deletions
diff --git a/chromium/components/previews/content/previews_hints.h b/chromium/components/previews/content/previews_hints.h
new file mode 100644
index 00000000000..60a70473e72
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+++ b/chromium/components/previews/content/previews_hints.h
@@ -0,0 +1,75 @@
+// Copyright 2018 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_PREVIEWS_CONTENT_PREVIEWS_HINTS_H_
+#define COMPONENTS_PREVIEWS_CONTENT_PREVIEWS_HINTS_H_
+
+#include <map>
+#include <memory>
+#include <set>
+
+#include "base/macros.h"
+#include "base/sequence_checker.h"
+#include "components/optimization_guide/proto/hints.pb.h"
+#include "components/previews/content/activation_list.h"
+#include "components/previews/content/previews_hints.h"
+#include "components/previews/core/previews_user_data.h"
+#include "components/url_matcher/url_matcher.h"
+
+class GURL;
+
+namespace optimization_guide {
+struct ComponentInfo;
+}
+
+namespace previews {
+
+// Holds previews hints extracted from the configuration.
+class PreviewsHints {
+ public:
+  ~PreviewsHints();
+
+  // Creates a Hints instance from the provided configuration.
+  static std::unique_ptr<PreviewsHints> CreateFromConfig(
+      const optimization_guide::proto::Configuration& config,
+      const optimization_guide::ComponentInfo& info);
+
+  // Whether the URL is whitelisted for the given previews type. If so,
+  // |out_inflation_percent| will be populated if meta data available for it.
+  bool IsWhitelisted(const GURL& url,
+                     PreviewsType type,
+                     int* out_inflation_percent);
+
+  // Whether |url| is whitelisted for previews type |type|. The method may
+  // make the decision based only on a partial comparison (e.g., only the
+  // hostname of |url|). As such, the method may return true even if |type|
+  // can't be used for the previews.
+  bool IsHostWhitelistedAtNavigation(const GURL& url,
+                                     previews::PreviewsType type) const;
+
+ private:
+  PreviewsHints();
+
+  // The URLMatcher used to match whether a URL has any hints associated with
+  // it.
+  url_matcher::URLMatcher url_matcher_;
+
+  // Holds the activation list of hosts extracted from the server hints
+  // configuration.
+  std::unique_ptr<ActivationList> activation_list_;
+
+  // A map from the condition set ID to associated whitelist Optimization
+  // details.
+  std::map<url_matcher::URLMatcherConditionSet::ID,
+           std::set<std::pair<PreviewsType, int>>>
+      whitelist_;
+
+  SEQUENCE_CHECKER(sequence_checker_);
+
+  DISALLOW_COPY_AND_ASSIGN(PreviewsHints);
+};
+
+}  // namespace previews
+
+#endif  // COMPONENTS_PREVIEWS_CONTENT_PREVIEWS_HINTS_H_
+\ No newline at end of file