Enable history counting for time ranges.

components/history/core/browser/history_backend.cc

 // 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.
 
 #include "components/history/core/browser/history_backend.h"
 
 #include <algorithm>
 #include <functional>
 #include <list>
 #include <map>
@@ skipping 1027 matching lines @@
   if (result->success && want_visits)
     db_->GetVisitsForURL(result->row.id(), &result->visits);
 }
 
 TypedUrlSyncableService* HistoryBackend::GetTypedUrlSyncableService() const {
   return typed_url_syncable_service_.get();
 }
 
 // Statistics ------------------------------------------------------------------
 
-HistoryCountResult HistoryBackend::GetHistoryCount() {
+HistoryCountResult HistoryBackend::GetHistoryCount(const Time& begin_time,
+                                                   const Time& end_time) {
   HistoryCountResult result;
   result.count = 0;
-  result.success = db_ && db_->GetHistoryCount(&result.count);
+  result.success =
+      db_ && db_->GetHistoryCount(begin_time, end_time, &result.count);
   return result;
 }
 
 // Keyword visits --------------------------------------------------------------
 
 void HistoryBackend::SetKeywordSearchTermsForURL(const GURL& url,
                                                  KeywordID keyword_id,
                                                  const base::string16& term) {
   if (!db_)
     return;
@@ skipping 1645 matching lines @@
   // transaction is currently open.
   db_->CommitTransaction();
   db_->Vacuum();
   db_->BeginTransaction();
   db_->GetStartDate(&first_recorded_time_);
 
   return true;
 }
 
 }  // namespace history