Implements frame sniffer to watch iframe loading state.

chrome/browser/chromeos/tab_first_render_watcher.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_CHROMEOS_TAB_FIRST_RENDER_WATCHER_H_
 #define CHROME_BROWSER_CHROMEOS_TAB_FIRST_RENDER_WATCHER_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 
+class RenderViewHost;
 class TabContents;
 
 namespace chromeos {
 
 // This class watches given TabContent's loading and rendering state change.
 // TODO(xiyuan): Move this to a proper place and share with HTMLDialogView.
 class TabFirstRenderWatcher : public NotificationObserver {
  public:
   class Delegate {
    public:
+    virtual void OnRenderHostCreated(RenderViewHost* host) = 0;
     virtual void OnTabMainFrameLoaded() = 0;
     virtual void OnTabMainFrameFirstRender() = 0;
   };
 
   TabFirstRenderWatcher(TabContents* tab, Delegate* delegate);
 
  private:
   // Overridden from NotificationObserver
   virtual void Observe(int type,
                        const NotificationSource& source,
@@ skipping 13 matching lines @@
   Delegate* delegate_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(TabFirstRenderWatcher);
 };
 
 }   // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_TAB_FIRST_RENDER_WATCHER_H_