Implement Chrome Extension TabCapture API.

chrome/browser/extensions/extension_tab_id_map.h

 // Copyright (c) 2011 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_EXTENSIONS_EXTENSION_TAB_ID_MAP_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_ID_MAP_H_
 
 #include <map>
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
 
 // This class keeps track of a map between renderer IDs and tab/window IDs, for
 // use on the IO thread. All methods should be called on the IO thread except
 // for Init and Shutdown.
 class ExtensionTabIdMap {
  public:
   static ExtensionTabIdMap* GetInstance();
 
   // These are called on the UI thread to start and stop listening to tab
   // notifications.
   void Init();
   void Shutdown();
 
   // Looks up the tab and window ID for a given render view. Returns true
   // if we have the IDs in our map. Called on the IO thread.
   bool GetTabAndWindowId(
       int render_process_host_id, int routing_id, int* tab_id, int* window_id);
+  bool GetProcessAndRoutingId(
+      int tab_id, int* render_process_host_id, int* routing_id);
 
  private:
   class TabObserver;
   friend class TabObserver;
   friend struct DefaultSingletonTraits<ExtensionTabIdMap>;
 
   typedef std::pair<int, int> RenderId;
   typedef std::pair<int, int> TabAndWindowId;
   typedef std::map<RenderId, TabAndWindowId> TabAndWindowIdMap;
 
   ExtensionTabIdMap();
   ~ExtensionTabIdMap();
 
   // Adds or removes a render view from our map.
   void SetTabAndWindowId(
       int render_process_host_id, int routing_id, int tab_id, int window_id);
   void ClearTabAndWindowId(
       int render_process_host_id, int routing_id);
 
   TabObserver* observer_;
   TabAndWindowIdMap map_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionTabIdMap);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_ID_MAP_H_