media: Implement zero-copy video playback for VP8.

media/filters/vpx_video_decoder.h

Index: media/filters/vpx_video_decoder.h
diff --git a/media/filters/vpx_video_decoder.h b/media/filters/vpx_video_decoder.h
index 5b0e5c03a6f4b10ec750c6d4bb36e6b8d9bb83f5..978e824d3ecab03c6204a61e23042c86aedf399a 100644
--- a/media/filters/vpx_video_decoder.h
+++ b/media/filters/vpx_video_decoder.h
@@ -22,6 +22,7 @@ class SingleThreadTaskRunner;
 }
 
 namespace media {
+class GpuMemoryBufferVideoFramePool;
 
 // Libvpx video decoder wrapper.
 // Note: VpxVideoDecoder accepts only YV12A VP8 content or VP9 content. This is
@@ -33,6 +34,8 @@ namespace media {
 class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
  public:
   VpxVideoDecoder();
+  explicit VpxVideoDecoder(
+      std::unique_ptr<GpuMemoryBufferVideoFramePool> gpu_video_frame_pool);
   ~VpxVideoDecoder() override;
 
   // VideoDecoder implementation.
@@ -74,6 +77,7 @@ class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
                  scoped_refptr<VideoFrame>* video_frame);
 
   bool CopyVpxImageToVideoFrame(const struct vpx_image* vpx_image,
+                                const scoped_refptr<DecoderBuffer>& buffer,
                                 scoped_refptr<VideoFrame>* video_frame);
 
   base::ThreadChecker thread_checker_;
@@ -98,7 +102,7 @@ class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
   // we share a per-process thread to avoid overly long blocks.
   scoped_refptr<base::SingleThreadTaskRunner> offload_task_runner_;
 
-  VideoFramePool frame_pool_;
+  std::unique_ptr<GpuMemoryBufferVideoFramePool> gpu_video_frame_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(VpxVideoDecoder);
 };