Precache tracking database

chrome/browser/precache/most_visited_urls_provider.h

+// Copyright 2013 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 CHROME_BROWSER_PRECACHE_MOST_VISITED_URLS_PROVIDER_H_
+#define CHROME_BROWSER_PRECACHE_MOST_VISITED_URLS_PROVIDER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "components/precache/core/url_list_provider.h"
+
+namespace history {
+class TopSites;
+}
+
+namespace precache {
+
+// A URLListProvider that provides a list of the user's most visited URLs.
+class MostVisitedURLsProvider : public URLListProvider {
+ public:
+  explicit MostVisitedURLsProvider(history::TopSites* top_sites);
+  ~MostVisitedURLsProvider();
+
+  // Returns a list of the user's most visited URLs via a callback. May be
+  // called from any thread. The callback may be run before the call to GetURLs
+  // returns.
+  virtual void GetURLs(const GetURLsCallback& callback) OVERRIDE;
+
+ private:
+  scoped_refptr<history::TopSites> top_sites_;
+
+  DISALLOW_COPY_AND_ASSIGN(MostVisitedURLsProvider);
+};
+
+}  // namespace precache
+
+#endif  // CHROME_BROWSER_PRECACHE_MOST_VISITED_URLS_PROVIDER_H_