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

chrome/browser/history/history.h

Index: chrome/browser/history/history.h
diff --git a/chrome/browser/history/history.h b/chrome/browser/history/history.h
index 7f2cf81be1c8f6530c50cc7707abd698ba3aeeee..4d9cce9a2bf51f23904e0eec21cc2affc03e7fe4 100644
--- a/chrome/browser/history/history.h
+++ b/chrome/browser/history/history.h
@@ -49,6 +49,7 @@ class HistoryBackend;
 class HistoryDatabase;
 struct HistoryDetails;
 class HistoryQueryTest;
+class TimeFilter;
 class URLDatabase;
 }  // namespace history
 
@@ -362,6 +363,14 @@ class HistoryService : public CancelableRequestProvider,
                               CancelableRequestConsumerBase* consumer,
                               const QueryMostVisitedURLsCallback& callback);
 
+  // Request the |result_count| most visited URLs during the time peiods
+  // specified in the |filter|.
+  Handle QueryMostVisitedURLsDuringTime(
+      int result_count,
+      const history::TimeFilter& filter,
+      CancelableRequestConsumerBase* consumer,
+      const QueryMostVisitedURLsCallback& callback);
+
   // Thumbnails ----------------------------------------------------------------
 
   // Implemented by consumers to get thumbnail data. Called when a request for