Fix VideoDecoderVpx to use pixel format the consumer wants.

remoting/codec/video_decoder_vpx.h

 // Copyright 2013 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 REMOTING_CODEC_VIDEO_DECODER_VPX_H_
 #define REMOTING_CODEC_VIDEO_DECODER_VPX_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "remoting/codec/scoped_vpx_codec.h"
 #include "remoting/codec/video_decoder.h"
 
 typedef const struct vpx_codec_iface vpx_codec_iface_t;
 typedef struct vpx_image vpx_image_t;
 
 namespace remoting {
 
 class VideoDecoderVpx : public VideoDecoder {
  public:
   // Create decoders for the specified protocol.
   static std::unique_ptr<VideoDecoderVpx> CreateForVP8();
   static std::unique_ptr<VideoDecoderVpx> CreateForVP9();
 
   ~VideoDecoderVpx() override;
 
   // VideoDecoder interface.
+  void SetPixelFormat(PixelFormat pixel_format) override;
   bool DecodePacket(const VideoPacket& packet,
                     webrtc::DesktopFrame* frame) override;
 
  private:
   explicit VideoDecoderVpx(vpx_codec_iface_t* codec);
 
   ScopedVpxCodec codec_;
+  PixelFormat pixel_format_ = PixelFormat::BGRA;
 
   DISALLOW_COPY_AND_ASSIGN(VideoDecoderVpx);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CODEC_VIDEO_DECODER_VP8_H_