Add placeholder chrome://media-internals page.

chrome/browser/ui/webui/media_internals_ui.h

Index: chrome/browser/ui/webui/media_internals_ui.h
diff --git a/chrome/browser/ui/webui/media_internals_ui.h b/chrome/browser/ui/webui/media_internals_ui.h
new file mode 100644
index 0000000000000000000000000000000000000000..ea5eeaddb3d6fabd08fb0b803665133d739c863c
--- /dev/null
+++ b/chrome/browser/ui/webui/media_internals_ui.h
@@ -0,0 +1,20 @@
+// 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_UI_WEBUI_MEDIA_INTERNALS_UI_H_
+#define CHROME_BROWSER_UI_WEBUI_MEDIA_INTERNALS_UI_H_
+#pragma once
+
+#include "chrome/browser/ui/webui/chrome_web_ui.h"
+
+// The implementation for the chrome://media-internals page.
+class MediaInternalsUI : public ChromeWebUI {
+ public:
+  explicit MediaInternalsUI(TabContents* contents);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MediaInternalsUI);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_MEDIA_INTERNALS_UI_H_