MediaRecorder: use VideoTrackRecorder::GetPreferredCodecId() when available

content/renderer/media/video_track_recorder.h

 // Copyright 2015 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 CONTENT_RENDERER_MEDIA_VIDEO_TRACK_RECORDER_H_
 #define CONTENT_RENDERER_MEDIA_VIDEO_TRACK_RECORDER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 19 matching lines @@
 
 // VideoTrackRecorder is a MediaStreamVideoSink that encodes the video frames
 // received from a Stream Video Track. This class is constructed and used on a
 // single thread, namely the main Render thread. This mirrors the other
 // MediaStreamVideo* classes that are constructed/configured on Main Render
 // thread but that pass frames on Render IO thread. It has an internal Encoder
 // with its own threading subtleties, see the implementation file.
 class CONTENT_EXPORT VideoTrackRecorder
     : NON_EXPORTED_BASE(public MediaStreamVideoSink) {
  public:
+  // Do not change the order of codecs; add new ones right before LAST.
   enum class CodecId {
     VP8,
     VP9,
     H264,
+    LAST
   };
   class Encoder;
 
   using OnEncodedVideoCB =
       base::Callback<void(const media::WebmMuxer::VideoParameters& params,
                           std::unique_ptr<std::string> encoded_data,
                           base::TimeTicks capture_timestamp,
                           bool is_key_frame)>;
 
+  static CodecId GetPreferredCodecId();
+
   VideoTrackRecorder(CodecId codec,
                      const blink::WebMediaStreamTrack& track,
                      const OnEncodedVideoCB& on_encoded_video_cb,
                      int32_t bits_per_second);
   ~VideoTrackRecorder() override;
 
   void Pause();
   void Resume();
 
   void OnVideoFrameForTesting(const scoped_refptr<media::VideoFrame>& frame,
@@ skipping 23 matching lines @@
   // Used to track the paused state during the initialization process.
   bool paused_before_init_;
 
   base::WeakPtrFactory<VideoTrackRecorder> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoTrackRecorder);
 };
 
 }  // namespace content
 #endif  // CONTENT_RENDERER_MEDIA_VIDEO_TRACK_RECORDER_H_