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

chrome/browser/history/history.cc

Index: chrome/browser/history/history.cc
diff --git a/chrome/browser/history/history.cc b/chrome/browser/history/history.cc
index b503dd2a4a6c525563faaca931bc04077fd7678d..fba6aae890165738f08c331937987d6de5029ab9 100644
--- a/chrome/browser/history/history.cc
+++ b/chrome/browser/history/history.cc
@@ -39,6 +39,7 @@
 #include "chrome/browser/history/in_memory_database.h"
 #include "chrome/browser/history/in_memory_history_backend.h"
 #include "chrome/browser/history/in_memory_url_index.h"
+#include "chrome/browser/history/time_filter.h"
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ -633,6 +634,18 @@ HistoryService::Handle HistoryService::QueryMostVisitedURLs(
                   result_count, days_back);
 }
 
+HistoryService::Handle HistoryService::QueryMostVisitedURLsDuringTime(
+    int result_count,
+    const history::TimeFilter& filter,
+    CancelableRequestConsumerBase* consumer,
+    const QueryMostVisitedURLsCallback& callback) {
+  return Schedule(PRIORITY_NORMAL,
+                  &HistoryBackend::QueryMostVisitedURLsDuringTime,
+                  consumer,
+                  new history::QueryMostVisitedURLsRequest(callback),
+                  result_count, filter);
+}
+
 void HistoryService::Observe(int type,
                              const content::NotificationSource& source,
                              const content::NotificationDetails& details) {