Add to the prerender history when no PrerenderContents is created.

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 631 matching lines @@
   // well as any swapped out WebContents queued for destruction.
   // Used both on destruction, and when clearing the browsing history.
   void DestroyAllContents(FinalStatus final_status);
 
   // Helper function to destroy a PrerenderContents with the specified
   // final_status, while at the same time recording that for the MatchComplete
   // case, that this prerender would have been used.
   void DestroyAndMarkMatchCompleteAsUsed(PrerenderContents* prerender_contents,
                                          FinalStatus final_status);
 
-  // Record a final status of a prerendered page in a histogram.
+  // 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 RecordFinalStatus(Origin origin,
-                         uint8 experiment_id,
-                         FinalStatus final_status) const;
+  void RecordFinalStatusWithoutCreatingPrerenderContents(

[mmenke, 2014/05/12 19:23:47]

Open to ideas for shorter method names, but I think this makes it much clearer
when it should be called.

+      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);
 
@@ skipping 87 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_