Log NTP hovers in 1993 clients

chrome/browser/ui/search/instant_ntp.h

Index: chrome/browser/ui/search/instant_ntp.h
diff --git a/chrome/browser/ui/search/instant_ntp.h b/chrome/browser/ui/search/instant_ntp.h
index 3000ee56425addcb03f62cc79ad86928a5c74e62..510fe085d2bbb4f11239efa3d503aee7f3c8a14d 100644
--- a/chrome/browser/ui/search/instant_ntp.h
+++ b/chrome/browser/ui/search/instant_ntp.h
@@ -42,6 +42,12 @@ class InstantNTP : public InstantPage,
   // the page is about to be committed.
   scoped_ptr<content::WebContents> ReleaseContents();
 
+  // Used to log each time the user mouses over NTP tiles or titles.

[samarth, 2013/07/11 18:29:47]

Sorry for the extremely late comments but please move this to InstantTab. 
InstantNTP is used to maintaing the _prerendered_ (invisible) NTP contents and
it doesn't make sense for it to be talking about hovers, etc.

+  static void CountMouseover(content::WebContents* contents);
+
+  // Used to log in UMA the total number of mouseovers over NTP tiles/titles.
+  static void EmitMouseoverCount(content::WebContents* contents);
+
  private:
   // Overridden from content::WebContentsObserver:
   virtual void RenderViewCreated(