Added HistoryService::GetHistoryCount() and helper functions in components/history

components/history/core/browser/history_service.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 COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 324 matching lines @@
   typedef base::Callback<void(const FilteredURLList*)>
       QueryFilteredURLsCallback;
 
   base::CancelableTaskTracker::TaskId QueryFilteredURLs(
       int result_count,
       const VisitFilter& filter,
       bool extended_info,
       const QueryFilteredURLsCallback& callback,
       base::CancelableTaskTracker* tracker);
 
+  // Statistics ----------------------------------------------------------------
+
+  // Gets the number of URLs as seen in chrome://history with infinite date
+  // range. If a URL is visited in multiple days, the URL is counted once for
+  // each day. For determination of the date, timestamps are converted to dates
+  // using local time.
+  typedef base::Callback<void(HistoryCountResult)> GetHistoryCountCallback;
+
+  base::CancelableTaskTracker::TaskId GetHistoryCount(
+      const GetHistoryCountCallback& callback,
+      base::CancelableTaskTracker* tracker);
+
   // Database management operations --------------------------------------------
 
   // Delete all the information related to a single url.
   void DeleteURL(const GURL& url);
 
   // Delete all the information related to a list of urls.  (Deleting
   // URLs one by one is slow as it has to flush to disk each time.)
   void DeleteURLsForTest(const std::vector<GURL>& urls);
 
   // Removes all visits in the selected time range (including the
@@ skipping 490 matching lines @@
 
   // All vended weak pointers are invalidated in Cleanup().
   base::WeakPtrFactory<HistoryService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_