Added a placeholder new media-internals page under a flag.

content/browser/resources/media/new/media_internals.js

+// Copyright (c) 2013 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.
+
+var media = {}
+
+var doNothing = function () {};
+
+media.initialize = doNothing;
+media.addAudioStream = doNothing;
+media.cacheEntriesByKey = doNothing;
+media.onReceiveEverything  = doNothing;
+media.onItemDeleted = doNothing;
+media.onRendererTerminated = doNothing;
+media.onNetUpdate = doNothing;
+media.onReceiveConstants = doNothing;
+media.onMediaEvent = doNothing;