Implements frame sniffer to watch iframe loading state.

chrome/browser/chromeos/tab_first_render_watcher.cc

 // 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.
 
 #include "chrome/browser/chromeos/tab_first_render_watcher.h"
 
 #include "content/browser/renderer_host/render_widget_host.h"
+#include "content/browser/renderer_host/render_view_host.h"
 #include "content/common/content_notification_types.h"
 #include "content/common/notification_details.h"
 #include "content/common/notification_source.h"
 
 namespace chromeos {
 
 TabFirstRenderWatcher::TabFirstRenderWatcher(TabContents* tab,
                                              Delegate* delegate)
     : state_(NONE),
       tab_contents_(tab),
       delegate_(delegate) {
   registrar_.Add(this,
       content::NOTIFICATION_RENDER_VIEW_HOST_CREATED_FOR_TAB,
       Source<TabContents>(tab_contents_));
   registrar_.Add(this,
       content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
       Source<TabContents>(tab_contents_));
 }
 
 void TabFirstRenderWatcher::Observe(int type,
     const NotificationSource& source, const NotificationDetails& details) {
   switch (type) {
     case content::NOTIFICATION_RENDER_VIEW_HOST_CREATED_FOR_TAB: {
       RenderWidgetHost* rwh = Details<RenderWidgetHost>(details).ptr();
       registrar_.Add(this,
           content::NOTIFICATION_RENDER_WIDGET_HOST_DID_PAINT,
           Source<RenderWidgetHost>(rwh));
+      delegate_->OnRenderHostCreated(Details<RenderViewHost>(details).ptr());
       break;
     }
     case content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME:
       if (state_ == NONE) {
         state_ = LOADED;
         delegate_->OnTabMainFrameLoaded();
       }
       break;
     case content::NOTIFICATION_RENDER_WIDGET_HOST_DID_PAINT:
       if (state_ == LOADED) {
         state_ = FIRST_PAINT;
         delegate_->OnTabMainFrameFirstRender();
       }
       break;
     default:
       NOTREACHED() << "unknown type" << type;
   }
 }
 
 }  // namespace chromeos