[Media Remoting] Add function to create interstitial.

media/remoting/remoting_interstitial_ui.h

+// Copyright 2016 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 MEDIA_REMOTING_REMOTING_INTERSTITIAL_UI_H_
+#define MEDIA_REMOTING_REMOTING_INTERSTITIAL_UI_H_
+
+#include "base/memory/ref_counted.h"
+#include "media/base/video_frame.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+
+namespace media {
+
+// Gets an 'interstitial' VideoFrame to paint on the media player when the
+// video is being played remotely.
+scoped_refptr<VideoFrame> GetInterstitial(SkCanvas* existing_frame_canvas,
+                                          bool is_remoting_successful);
+
+}  // namespace media
+
+#endif  // MEDIA_REMOTING_REMOTING_INTERSTITIAL_UI_H_