Add ExternalPrerenderRequestHandler and related API

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 133 matching lines @@
   PrerenderHandle* AddPrerenderFromOmnibox(
       const GURL& url,
       content::SessionStorageNamespace* session_storage_namespace,
       const gfx::Size& size);
 
   PrerenderHandle* AddPrerenderFromLocalPredictor(
       const GURL& url,
       content::SessionStorageNamespace* session_storage_namespace,
       const gfx::Size& size);
 
+  PrerenderHandle* AddPrerenderFromExternalRequest(
+      const GURL& url,
+      const content::Referrer& referrer,
+      content::SessionStorageNamespace* session_storage_namespace,
+      const gfx::Size& size);
+
   // If |process_id| and |view_id| refer to a running prerender, destroy
   // it with |final_status|.
   virtual void DestroyPrerenderForRenderView(int process_id,
                                              int view_id,
                                              FinalStatus final_status);
 
   // Cancels all active prerenders.
   void CancelAllPrerenders();
 
   // If |url| matches a valid prerendered page and |params| are compatible, try
@@ skipping 44 matching lines @@
   static bool IsControlGroup(uint8 experiment_id);
   static bool IsNoUseGroup();
 
   // Query the list of current prerender pages to see if the given web contents
   // is prerendering a page. The optional parameter |origin| is an output
   // parameter which, if a prerender is found, is set to the Origin of the
   // prerender |web_contents|.
   bool IsWebContentsPrerendering(const content::WebContents* web_contents,
                                  Origin* origin) const;
 
+  // Whether the PrerenderManager has an active prerender with the given url and
+  // SessionStorageNamespace associated with the given WebContens.
+  bool HasPrerenderedUrl(GURL url, content::WebContents* web_contents) const;
+
   // Returns the PrerenderContents object for the given web_contents if it's
   // used for an active prerender page, otherwise returns NULL.
   PrerenderContents* GetPrerenderContents(
       const content::WebContents* web_contents) const;
 
   // Returns a list of all WebContents being prerendered.
   const std::vector<content::WebContents*> GetAllPrerenderingContents() const;
 
   // Maintaining and querying the set of WebContents belonging to this
   // PrerenderManager that are currently showing prerendered pages.
@@ skipping 418 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderManager);
 };
 
 PrerenderManager* FindPrerenderManagerUsingRenderProcessId(
     int render_process_id);
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_