Land http://codereview.chromium.org/159067:

chrome/browser/extensions/extension_host.h

 // Copyright (c) 2006-2009 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_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 
 #include <string>
 
 #include "base/scoped_ptr.h"
@@ skipping 22 matching lines @@
 // in the browser UI, or it may be hidden.
 class ExtensionHost : public RenderViewHostDelegate,
                       public RenderViewHostDelegate::View,
                       public ExtensionFunctionDispatcher::Delegate,
                       public NotificationObserver {
  public:
   // Enable DOM automation in created render view hosts.
   static void EnableDOMAutomation() { enable_dom_automation_ = true; }
 
   ExtensionHost(Extension* extension, SiteInstance* site_instance,
-                const GURL& url);
+                const GURL& url, ViewType::Type host_type);
   ~ExtensionHost();
 
 #if defined(TOOLKIT_VIEWS)
   void set_view(ExtensionView* view) { view_.reset(view); }
   ExtensionView* view() const { return view_.get(); }
 #elif defined(OS_LINUX)
   ExtensionViewGtk* view() const { return view_.get(); }
 #else
   // TODO(port): implement
   void* view() const { return NULL; }
@@ skipping 23 matching lines @@
   void NavigateToURL(const GURL& url);
 
   // Restarts extension's renderer process. Can be called only if the renderer
   // process crashed.
   void RecoverCrashedExtension();
 
   // RenderViewHostDelegate implementation.
   virtual RenderViewHostDelegate::View* GetViewDelegate();
   virtual const GURL& GetURL() const { return url_; }
   virtual void RenderViewCreated(RenderViewHost* render_view_host);
+  virtual ViewType::Type GetRenderViewType() const;
+  virtual int GetBrowserWindowID() const;
   virtual void RenderViewGone(RenderViewHost* render_view_host);
   virtual void DidNavigate(RenderViewHost* render_view_host,
                            const ViewHostMsg_FrameNavigate_Params& params);
   virtual void DidStopLoading(RenderViewHost* render_view_host);
   virtual void DocumentAvailableInMainFrame(RenderViewHost* render_view_host);
 
   virtual WebPreferences GetWebkitPrefs();
   virtual void ProcessDOMUIMessage(const std::string& message,
                                    const std::string& content,
                                    int request_id,
@@ skipping 73 matching lines @@
   // True if the main frame has finished parsing.
   bool document_element_available_;
 
   // The URL being hosted.
   GURL url_;
 
   NotificationRegistrar registrar_;
 
   scoped_ptr<ExtensionFunctionDispatcher> extension_function_dispatcher_;
 
+  // Only EXTENSION_TOOLSTRIP and EXTENSION_BACKGROUND_PAGE are used here,
+  // others are not hostd by ExtensionHost.
+  ViewType::Type extension_host_type_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_