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

chrome/browser/history/history_extension_api.h

Index: chrome/browser/history/history_extension_api.h
diff --git a/chrome/browser/history/history_extension_api.h b/chrome/browser/history/history_extension_api.h
index e66ea76882ed063d6a6119c07cd09246fffe799f..bd29602d4782c9cf7af9fd5f31d140dcf5366c18 100644
--- a/chrome/browser/history/history_extension_api.h
+++ b/chrome/browser/history/history_extension_api.h
@@ -83,6 +83,16 @@ class HistoryFunctionWithCallback : public HistoryFunction {
   void SendResponseToCallback();
 };
 
+class GetMostVisitedHistoryFunction : public HistoryFunctionWithCallback {
+ public:
+  virtual bool RunAsyncImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME("history.getMostVisited");
+
+  // Callback for the history function to provide results.
+  void QueryComplete(CancelableRequestProvider::Handle handle,
+                     history::MostVisitedURLList data);
+};
+
 class GetVisitsHistoryFunction : public HistoryFunctionWithCallback {
  public:
   // Override HistoryFunction.