Revert of Delete unused and almost unused frame-related methods.

webrtc/common_video/video_frame.cc

 /*
  *  Copyright (c) 2012 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 137 matching lines @@
 
 bool VideoFrame::IsZeroSize() const {
   return !video_frame_buffer_;
 }
 
 const rtc::scoped_refptr<VideoFrameBuffer>& VideoFrame::video_frame_buffer()
     const {
   return video_frame_buffer_;
 }
 
+void VideoFrame::set_video_frame_buffer(
+    const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer) {
+  RTC_DCHECK(buffer);
+  video_frame_buffer_ = buffer;
+}
+
+VideoFrame VideoFrame::ConvertNativeToI420Frame() const {
+  RTC_DCHECK(video_frame_buffer_->native_handle());
+  VideoFrame frame;
+  frame.ShallowCopy(*this);
+  frame.set_video_frame_buffer(video_frame_buffer_->NativeToI420Buffer());
+  return frame;
+}
+
 size_t EncodedImage::GetBufferPaddingBytes(VideoCodecType codec_type) {
   switch (codec_type) {
     case kVideoCodecVP8:
     case kVideoCodecVP9:
       return 0;
     case kVideoCodecH264:
       return kBufferPaddingBytesH264;
     case kVideoCodecI420:
     case kVideoCodecRED:
     case kVideoCodecULPFEC:
     case kVideoCodecGeneric:
     case kVideoCodecUnknown:
       return 0;
   }
   RTC_NOTREACHED();
   return 0;
 }
 
 }  // namespace webrtc