Introduce an IsMutable method on VideoFrameBuffer.

webrtc/media/engine/webrtcvideoframe.cc

 /*
  *  Copyright (c) 2011 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.
  */
 
@@ skipping 94 matching lines @@
 }
 
 int32_t WebRtcVideoFrame::GetUPitch() const {
   return video_frame_buffer_ ? video_frame_buffer_->stride(kUPlane) : 0;
 }
 
 int32_t WebRtcVideoFrame::GetVPitch() const {
   return video_frame_buffer_ ? video_frame_buffer_->stride(kVPlane) : 0;
 }
 
 bool WebRtcVideoFrame::IsExclusive() const {

[perkj_webrtc, 2016/04/14 06:34:51]

Should IsExlusive also be removed and a user forced to use 
video_frame_buffer()->IsMutable() ?

[nisse-webrtc, 2016/04/14 06:42:28]

I think so.

[pbos-webrtc, 2016/04/14 12:51:13]

I agree.

-  return video_frame_buffer_->HasOneRef();
+  return video_frame_buffer_->IsMutable();
 }
 
 void* WebRtcVideoFrame::GetNativeHandle() const {
   return video_frame_buffer_ ? video_frame_buffer_->native_handle() : nullptr;
 }
 
 rtc::scoped_refptr<webrtc::VideoFrameBuffer>
 WebRtcVideoFrame::GetVideoFrameBuffer() const {
   return video_frame_buffer_;
 }
@@ skipping 122 matching lines @@
       rotated_frame_->GetVPlane(), rotated_frame_->GetVPitch(),
       orig_width, orig_height,
       static_cast<libyuv::RotationMode>(GetVideoRotation()));
   if (ret == 0) {
     return rotated_frame_.get();
   }
   return nullptr;
 }
 
 }  // namespace cricket