Add UMA metrics for Android Chrome Google Search.

chrome/browser/prerender/prerender_manager.h

 // Copyright (c) 2012 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_PRERENDER_PRERENDER_MANAGER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 
 #include <list>
 #include <map>
 #include <string>
@@ skipping 368 matching lines @@
 
   // To be called once the cookie store for this profile has been loaded.
   void OnCookieStoreLoaded();
 
   // For testing purposes. Issues a callback once the cookie store has been
   // loaded.
   void set_on_cookie_store_loaded_cb_for_testing(base::Closure cb) {
     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> {
    public:
     struct OrderByExpiryTime;
 
     PrerenderData(PrerenderManager* manager,
                   PrerenderContents* contents,
                   base::TimeTicks expiry_time);
 
@@ skipping 254 matching lines @@
                                          FinalStatus final_status);
 
   // Records the final status a prerender in the case that a PrerenderContents
   // was never created, and also adds a PrerenderHistory entry.
   // This is a helper function which will ultimately call
   // RecordFinalStatusWthMatchCompleteStatus, using MATCH_COMPLETE_DEFAULT.
   void RecordFinalStatusWithoutCreatingPrerenderContents(
       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,
                                                bool cookies_exist);
   void LoggedInPredictorDataReceived(scoped_ptr<LoggedInStateMap> new_map);
 
   void RecordEvent(PrerenderContents* contents, PrerenderEvent event) const;
 
   // Swaps a prerender |prerender_data| for |url| into the tab, replacing
   // |web_contents|.  Returns the new WebContents that was swapped in, or NULL
@@ skipping 83 matching lines @@
   bool cookie_store_loaded_;
 
   base::Closure on_cookie_store_loaded_cb_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderManager);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_