Adds the MostVisitedAction stat. This stat will provide a baseline to compare

chrome/browser/ui/webui/ntp/most_visited_handler.h

Index: chrome/browser/ui/webui/ntp/most_visited_handler.h
===================================================================
--- chrome/browser/ui/webui/ntp/most_visited_handler.h	(revision 134118)
+++ chrome/browser/ui/webui/ntp/most_visited_handler.h	(working copy)
@@ -52,6 +52,12 @@
   // Callback for the "clearMostVisitedURLsBlacklist" message.
   void HandleClearBlacklist(const base::ListValue* args);
 
+  // Callback for the "mostVisitedAction" message.
+  void HandleMostVisitedAction(const base::ListValue* args);
+
+  // Callback for the "mostVisitedSelected" message.
+  void HandleMostVisitedSelected(const base::ListValue* args);
+
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
@@ -101,6 +107,12 @@
   // Keep the results of the db query here.
   scoped_ptr<base::ListValue> pages_value_;
 
+  // Whether the user has viewed the 'most visited' pane.
+  bool most_visited_viewed_;
+
+  // Whether the user has performed a "tracked" action to leave the page or not.
+  bool user_action_logged_;
+
   DISALLOW_COPY_AND_ASSIGN(MostVisitedHandler);
 };