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diff --git a/chrome/browser/tab_render_watcher.h b/chrome/browser/tab_render_watcher.h
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+++ b/chrome/browser/tab_render_watcher.h
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+// 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_TAB_RENDER_WATCHER_H_
+#define CHROME_BROWSER_TAB_RENDER_WATCHER_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+class RenderViewHost;
+
+namespace content {
+class WebContents;
+}
+
+// This class watches given TabContent's loading and rendering state change.
+class TabRenderWatcher : public content::NotificationObserver {
+ public:
+  class Delegate {
+   public:
+    virtual void OnRenderHostCreated(RenderViewHost* host) = 0;
+    virtual void OnTabMainFrameLoaded() = 0;
+    virtual void OnTabMainFrameRender() = 0;
+  };
+
+  TabRenderWatcher(content::WebContents* tab, Delegate* delegate);
+
+ private:
+  // Overridden from content::NotificationObserver
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // Has the renderer loaded the page yet?
+  bool loaded_;
+
+  // WebContents that this class watches.
+  content::WebContents* web_contents_;
+
+  // Delegate to notify.
+  Delegate* delegate_;
+
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabRenderWatcher);
+};
+
+#endif  // CHROME_BROWSER_TAB_RENDER_WATCHER_H_