Revert of Delete deprecated and transitional stuff related to video frame refactoring.

webrtc/common_video/include/video_frame_buffer.h

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_COMMON_VIDEO_INCLUDE_VIDEO_FRAME_BUFFER_H_
 #define WEBRTC_COMMON_VIDEO_INCLUDE_VIDEO_FRAME_BUFFER_H_
 
 #include <memory>
 
 #include "webrtc/api/video/video_frame_buffer.h"
+// TODO(nisse): For backwards compatibility, files including this file
+// expect it to declare I420Buffer. Delete after callers are updated.
+#include "webrtc/api/video/i420_buffer.h"
 #include "webrtc/base/callback.h"
 #include "webrtc/base/scoped_ref_ptr.h"
 
 namespace webrtc {
 
 // Base class for native-handle buffer is a wrapper around a |native_handle|.
 // This is used for convenience as most native-handle implementations can share
 // many VideoFrame implementations, but need to implement a few others (such
 // as their own destructors or conversion methods back to software I420).
 class NativeHandleBuffer : public VideoFrameBuffer {
@@ skipping 53 matching lines @@
   const uint8_t* const v_plane_;
   const int y_stride_;
   const int u_stride_;
   const int v_stride_;
   rtc::Callback0<void> no_longer_used_cb_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_VIDEO_INCLUDE_VIDEO_FRAME_BUFFER_H_