Add a hang monitor for Pepper plugins

chrome/browser/ui/browser.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_UI_BROWSER_H_
 #define CHROME_BROWSER_UI_BROWSER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 1068 matching lines @@
 
   virtual void FindReply(content::WebContents* tab,
                          int request_id,
                          int number_of_matches,
                          const gfx::Rect& selection_rect,
                          int active_match_ordinal,
                          bool final_update) OVERRIDE;
 
   virtual void CrashedPlugin(content::WebContents* tab,
                              const FilePath& plugin_path) OVERRIDE;
+  virtual void PluginHungStatusChanged(content::WebContents* tab,
+                                       int plugin_child_id,
+                                       const FilePath& plugin_path,
+                                       bool is_hung) OVERRIDE;
 
   virtual void RequestToLockMouse(content::WebContents* tab) OVERRIDE;
   virtual void LostMouseLock() OVERRIDE;
 
   // Overridden from CoreTabHelperDelegate:
   // Note that the caller is responsible for deleting |old_tab_contents|.
   virtual void SwapTabContents(TabContentsWrapper* old_tab_contents,
                                TabContentsWrapper* new_tab_contents) OVERRIDE;
 
   // Overridden from SearchEngineTabHelperDelegate:
@@ skipping 412 matching lines @@
   bool window_has_shown_;
 
   // Currently open color chooser. Non-NULL after OpenColorChooser is called and
   // before DidEndColorChooser is called.
   scoped_ptr<content::ColorChooser> color_chooser_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_H_