Log NTP hovers in 1993 clients

chrome/browser/ui/search/instant_ntp.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_UI_SEARCH_INSTANT_NTP_H_
 #define CHROME_BROWSER_UI_SEARCH_INSTANT_NTP_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 24 matching lines @@
   // |on_stale_callback| will be called when |loader_| determines the page to
   // be stale.
   void InitContents(Profile* profile,
                     const content::WebContents* active_tab,
                     const base::Closure& on_stale_callback);
 
   // Releases the WebContents for the Instant page.  This should be called when
   // 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(
       content::RenderViewHost* render_view_host) OVERRIDE;
   virtual void RenderViewGone(
       base::TerminationStatus status) OVERRIDE;
 
   // Overriden from InstantLoader::Delegate:
   virtual void OnSwappedContents() OVERRIDE;
   virtual void OnFocus() OVERRIDE;
   virtual void OnMouseDown() OVERRIDE;
   virtual void OnMouseUp() OVERRIDE;
   virtual content::WebContents* OpenURLFromTab(
       content::WebContents* source,
       const content::OpenURLParams& params) OVERRIDE;
   virtual void LoadCompletedMainFrame() OVERRIDE;
 
   InstantLoader loader_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantNTP);
 };
 
 #endif  // CHROME_BROWSER_UI_SEARCH_INSTANT_NTP_H_