Add UMA metrics for Android Chrome Google Search.

chrome/browser/prerender/prerender_manager.h

Index: chrome/browser/prerender/prerender_manager.h
diff --git a/chrome/browser/prerender/prerender_manager.h b/chrome/browser/prerender/prerender_manager.h
index 9118533223a773dcf219be9a302ad54bae6f68c8..01d992b63d25b7d147403bef4b8333ddec4bfc70 100644
--- a/chrome/browser/prerender/prerender_manager.h
+++ b/chrome/browser/prerender/prerender_manager.h
@@ -386,6 +386,9 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
     on_cookie_store_loaded_cb_for_testing_ = cb;
   }
 
+  // Returns whether prerendering is currently enabled for this manager.
+  bool IsEnabled() const;

[Peter Kasting, 2014/06/20 01:23:19]

Nit: I suggest putting this just above AddProfileNetworkBytesIfEnabled() since
both relate in some sense to whether prerendering is enabled.

[kmadhusu, 2014/06/20 01:40:51]

Done.

+
  protected:
   class PendingSwap;
   class PrerenderData : public base::SupportsWeakPtr<PrerenderData> {
@@ -660,9 +663,6 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
       const GURL& url, Origin origin, uint8 experiment_id,
       FinalStatus final_status) const;
 
-  // Returns whether prerendering is currently enabled for this manager.
-  // Must be called on the UI thread.
-  bool IsEnabled() const;
 
   void CookieChanged(ChromeCookieDetails* details);
   void CookieChangedAnyCookiesLeftLookupResult(const std::string& domain_key,