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diff --git a/chrome/browser/history/top_sites_backend.h b/chrome/browser/history/top_sites_backend.h
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+++ b/chrome/browser/history/top_sites_backend.h
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+// Copyright (c) 2010 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_HISTORY_TOP_SITES_BACKEND_H_
+#define CHROME_BROWSER_HISTORY_TOP_SITES_BACKEND_H_
+#pragma once
+
+#include "base/file_path.h"
+#include "base/ref_counted.h"
+#include "base/scoped_ptr.h"
+#include "chrome/browser/cancelable_request.h"
+#include "chrome/browser/history/history_types.h"
+
+class FilePath;
+
+namespace history {
+
+class TopSitesDatabase;
+
+// Service used by TopSites to have db interaction happen on the DB thread.  All
+// public methods are invoked on the ui thread and get funneled to the DB
+// thread.
+class TopSitesBackend
+    : public base::RefCountedThreadSafe<TopSitesBackend>,
+      public CancelableRequestProvider {
+ public:
+  TopSitesBackend();
+
+  void Init(const FilePath& path);
+
+  // Schedules the db to be shutdown.
+  void Shutdown();
+
+  // The boolean parameter indicates if the DB existed on disk or needs to be
+  // migrated.
+  typedef Callback3<Handle, scoped_refptr<MostVisitedThumbnails>, bool >::Type
+      GetMostVisitedThumbnailsCallback;
+  typedef CancelableRequest1<TopSitesBackend::GetMostVisitedThumbnailsCallback,
+                             scoped_refptr<MostVisitedThumbnails> >
+      GetMostVisitedThumbnailsRequest;
+
+  // Fetches MostVisitedThumbnails.
+  Handle GetMostVisitedThumbnails(CancelableRequestConsumerBase* consumer,
+                                  GetMostVisitedThumbnailsCallback* callback);
+
+  // Updates top sites database from the specified delta.
+  void UpdateTopSites(const TopSitesDelta& delta);
+
+  // Sets the thumbnail.
+  void SetPageThumbnail(const MostVisitedURL& url,
+                        int url_rank,
+                        const Images& thumbnail);
+
+  // Deletes the database and recreates it.
+  void ResetDatabase();
+
+  typedef Callback1<Handle>::Type EmptyRequestCallback;
+  typedef CancelableRequest<TopSitesBackend::EmptyRequestCallback>
+      EmptyRequestRequest;
+
+  // Schedules a request that does nothing on the DB thread, but then notifies
+  // the callback on the calling thread. This is used to make sure the db has
+  // finished processing a request.
+  Handle DoEmptyRequest(CancelableRequestConsumerBase* consumer,
+                        EmptyRequestCallback* callback);
+
+ private:
+  friend class base::RefCountedThreadSafe<TopSitesBackend>;
+
+  ~TopSitesBackend();
+
+  // Invokes Init on the db_.
+  void InitDBOnDBThread(const FilePath& path);
+
+  // Shuts down the db.
+  void ShutdownDBOnDBThread();
+
+  // Does the work of getting the most visted thumbnails.
+  void GetMostVisitedThumbnailsOnDBThread(
+      scoped_refptr<GetMostVisitedThumbnailsRequest> request);
+
+  // Updates top sites.
+  void UpdateTopSitesOnDBThread(const TopSitesDelta& delta);
+
+  // Sets the thumbnail.
+  void SetPageThumbnailOnDBThread(const MostVisitedURL& url,
+                                  int url_rank,
+                                  const Images& thumbnail);
+
+  // Resets the database.
+  void ResetDatabaseOnDBThread(const FilePath& file_path);
+
+  // Notifies the request.
+  void DoEmptyRequestOnDBThread(scoped_refptr<EmptyRequestRequest> request);
+
+  FilePath db_path_;
+
+  scoped_ptr<TopSitesDatabase> db_;
+
+  DISALLOW_COPY_AND_ASSIGN(TopSitesBackend);
+};
+
+}  // namespace history
+
+#endif  // CHROME_BROWSER_HISTORY_TOP_SITES_BACKEND_H_