Add TODO comments on deprecated VideoFrame methods.

webrtc/media/engine/webrtcvideoframe.h

 /*
  *  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.
  */
 
 #ifndef WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAME_H_
 #define WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAME_H_
 
 #include <memory>
 
 #include "webrtc/base/buffer.h"
 #include "webrtc/base/refcount.h"
 #include "webrtc/base/scoped_ref_ptr.h"
 #include "webrtc/common_types.h"
 #include "webrtc/common_video/include/video_frame_buffer.h"
 #include "webrtc/media/base/videoframe.h"
 
 namespace cricket {
 
 struct CapturedFrame;
 
+// TODO(nisse): This class will be deleted when the cricket::VideoFrame and
+// webrtc::VideoFrame classes are merged. See
+// https://bugs.chromium.org/p/webrtc/issues/detail?id=5682. Try to use only the
+// preferred constructor, and the non-deprecated methods of the VideoFrame base
+// class.
 class WebRtcVideoFrame : public VideoFrame {
  public:
   WebRtcVideoFrame();
 
-  // Preferred construction, with microsecond timestamp.
+  // Preferred constructor.
   WebRtcVideoFrame(const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer,
                    webrtc::VideoRotation rotation,
                    int64_t timestamp_us);
 
-  // TODO(nisse): Deprecate/delete.
+  // TODO(nisse): Deprecated, delete as soon as all callers have switched to the
+  // above constructor with microsecond timestamp.
   WebRtcVideoFrame(const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer,
                    int64_t time_stamp_ns,
                    webrtc::VideoRotation rotation);
 
   ~WebRtcVideoFrame();
 
   // Creates a frame from a raw sample with FourCC "format" and size "w" x "h".
   // "h" can be negative indicating a vertically flipped image.
   // "dh" is destination height if cropping is desired and is always positive.
   // Returns "true" if successful.
@@ skipping 67 matching lines @@
   webrtc::VideoRotation rotation_;
 
   // This is mutable as the calculation is expensive but once calculated, it
   // remains const.
   mutable std::unique_ptr<VideoFrame> rotated_frame_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAME_H_