Create prerender event histograms by origin & experiment.

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 642 matching lines @@
 
   void CookieChanged(ChromeCookieDetails* details);
   void CookieChangedAnyCookiesLeftLookupResult(const std::string& domain_key,
                                                bool cookies_exist);
   void LoggedInPredictorDataReceived(scoped_ptr<LoggedInStateMap> new_map);
 
   void ProcessMergeResult(PrerenderData* prerender_data,
                           bool timed_out,
                           content::SessionStorageNamespace::MergeResult result);
 
-  void RecordEvent(PrerenderEvent event) const;
+  void RecordEvent(PrerenderContents* contents, PrerenderEvent event) const;
 
   // Swaps a prerender for |url| into the tab, replacing |web_contents|.
   // Returns the new WebContents that was swapped in, or NULL if a swap-in
   // was not possible. Optionally, a |swap_candidate| can be specified.
   // Must be supplied if a merge has completed and we retry swap.
   // That's because we must skip the check whether a PrerenderData object that
   // could be swapped in is used for a pending merge, if the PrerenderData
   // object being considered is the one for which the merge has just completed
   // and which is intended to be swapped in.
   content::WebContents* SwapInternal(const GURL& url,
@@ skipping 85 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderManager);
 };
 
 PrerenderManager* FindPrerenderManagerUsingRenderProcessId(
     int render_process_id);
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_