android: Add a method to let Java know whether a prerender has finished loading.

chrome/browser/prerender/external_prerender_handler_android.h

 // Copyright 2013 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_EXTERNAL_PRERENDER_HANDLER_ANDROID_H_
 #define CHROME_BROWSER_PRERENDER_EXTERNAL_PRERENDER_HANDLER_ANDROID_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 30 matching lines @@
   void CancelCurrentPrerender(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& object);
 
   // Whether the PrerenderManager associated with the given profile has any
   // prerenders for the url.
   static bool HasPrerenderedUrl(Profile* profile,
                                 GURL url,
                                 content::WebContents* web_contents);
 
+  // Whether the PrerenderManager associated with the given profile has any
+  // prerenders for the url, and the prerender has finished loading.
+  static bool HasPrerenderedAndFinishedLoadingUrl(
+      Profile* profile,
+      GURL url,
+      content::WebContents* web_contents);
+
   static bool RegisterExternalPrerenderHandlerAndroid(JNIEnv* env);
 
  private:
   virtual ~ExternalPrerenderHandlerAndroid();
   scoped_ptr<prerender::PrerenderHandle> prerender_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalPrerenderHandlerAndroid);
 };
 
 } // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_EXTERNAL_PRERENDER_HANDLER_ANDROID_H_