First version of the time slicing on the urls. Not ready for review yet.

chrome/browser/history/history_backend.h

 // Copyright (c) 2012 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_HISTORY_BACKEND_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_
 #pragma once
 
 #include <string>
 #include <utility>
@@ skipping 16 matching lines @@
 
 class BookmarkService;
 struct DownloadPersistentStoreInfo;
 class TestingProfile;
 struct ThumbnailScore;
 
 namespace history {
 
 class CommitLaterTask;
 class HistoryPublisher;
+class TimeFilter;
 
 // *See the .cc file for more information on the design.*
 //
 // Internal history implementation which does most of the work of the history
 // system. This runs on a background thread (to not block the browser when we
 // do expensive operations) and is NOT threadsafe, so it must only be called
 // from message handlers on the background thread. Invoking on another thread
 // requires threadsafe refcounting.
 //
 // Most functions here are just the implementations of the corresponding
@@ skipping 119 matching lines @@
       int result_count);
 
   // Request the |result_count| most visited URLs and the chain of
   // redirects leading to each of these URLs. |days_back| is the
   // number of days of history to use. Used by TopSites.
   void QueryMostVisitedURLs(
       scoped_refptr<QueryMostVisitedURLsRequest> request,
       int result_count,
       int days_back);
 
+  // Request the |result_count| most visited URLs and the chain of redirects
+  // leading to each of these URLs, during the time peiods specified in the
+  // |filter|.
+  void QueryMostVisitedURLsDuringTime(
+      scoped_refptr<QueryMostVisitedURLsRequest> request,
+      int result_count,
+      const history::TimeFilter& filter);
+
   // QueryMostVisitedURLs without the request.
   void QueryMostVisitedURLsImpl(int result_count,
                                 int days_back,
                                 MostVisitedURLList* result);
 
   // Computes the most recent URL(s) that the given canonical URL has
   // redirected to and returns true on success. There may be more than one
   // redirect in a row, so this function will fill the given array with the
   // entire chain. If there are no redirects for the most recent visit of the
   // URL, or the URL is not in history, returns false.
@@ skipping 458 matching lines @@
   // Publishes the history to all indexers which are registered to receive
   // history data from us. Can be NULL if there are no listeners.
   scoped_ptr<HistoryPublisher> history_publisher_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryBackend);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_