Allow to use {FFmpeg/Vpx}VideoDecoder from a UtilityProcess

media/filters/vpx_video_decoder.h

 // Copyright (c) 2012 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 MEDIA_FILTERS_VPX_VIDEO_DECODER_H_
 #define MEDIA_FILTERS_VPX_VIDEO_DECODER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
@@ skipping 15 matching lines @@
 // Libvpx video decoder wrapper.
 // Note: VpxVideoDecoder accepts only YV12A VP8 content or VP9 content. This is
 // done to avoid usurping FFmpeg for all VP8 decoding, because the FFmpeg VP8
 // decoder is faster than the libvpx VP8 decoder.
 // Alpha channel, if any, is sent in the DecoderBuffer's side_data() as a frame
 // on its own of which the Y channel is taken [1].
 // [1] http://wiki.webmproject.org/alpha-channel
 class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
  public:
   VpxVideoDecoder();
+  explicit VpxVideoDecoder(
+      std::unique_ptr<VideoFrameProvider> video_frame_provider);
   ~VpxVideoDecoder() override;
 
   // VideoDecoder implementation.
   std::string GetDisplayName() const override;
   void Initialize(const VideoDecoderConfig& config,
                   bool low_delay,
                   CdmContext* cdm_context,
                   const InitCB& init_cb,
                   const OutputCB& output_cb) override;
   void Decode(const scoped_refptr<DecoderBuffer>& buffer,
@@ skipping 67 matching lines @@
   scoped_refptr<base::SingleThreadTaskRunner> offload_task_runner_;
 
   VideoFramePool frame_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(VpxVideoDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_VPX_VIDEO_DECODER_H_