Add instrumentation to see how often a local predictor prerender could be

chrome/browser/prerender/prerender_handle.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_HANDLE_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_HANDLE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
@@ skipping 56 matching lines @@
   // the handle. If the prerender handle is already invalid, this call does
   // nothing.
   void OnCancel();
 
   // True if this prerender is currently active.
   bool IsPrerendering() const;
 
   // True if we started a prerender, and it has finished loading.
   bool IsFinishedLoading() const;
 
+  // Returns whether the prerender matches the URL provided.
+  bool Matches(
+      const GURL& url,
+      const content::SessionStorageNamespace* session_storage_namespace) const;
+
  private:
   friend class PrerenderManager;
 
   explicit PrerenderHandle(PrerenderManager::PrerenderData* prerender_data);
 
   void AdoptPrerenderDataFrom(PrerenderHandle* other_handle);
 
   // From PrerenderContents::Observer:
   virtual void OnPrerenderStart(PrerenderContents* prerender_contents) OVERRIDE;
   virtual void OnPrerenderStopLoading(PrerenderContents* prerender_contents)
       OVERRIDE;
   virtual void OnPrerenderStop(PrerenderContents* prerender_contents) OVERRIDE;
   virtual void OnPrerenderAddAlias(PrerenderContents* prerender_contents,
                                    const GURL& alias_url) OVERRIDE;
   virtual void OnPrerenderCreatedMatchCompleteReplacement(
       PrerenderContents* contents, PrerenderContents* replacement) OVERRIDE;
 
   Observer* observer_;
 
   base::WeakPtr<PrerenderManager::PrerenderData> prerender_data_;
   base::WeakPtrFactory<PrerenderHandle> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderHandle);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_HANDLE_H_