media: Implement zero-copy video playback for ffmpeg.

media/filters/ffmpeg_video_decoder.h

Index: media/filters/ffmpeg_video_decoder.h
diff --git a/media/filters/ffmpeg_video_decoder.h b/media/filters/ffmpeg_video_decoder.h
index 30c81346451aba58616f37b9ca41baa8ff78f71d..44d77821ea1651af9bf40b0041c2b1cb69f47eb4 100644
--- a/media/filters/ffmpeg_video_decoder.h
+++ b/media/filters/ffmpeg_video_decoder.h
@@ -13,7 +13,6 @@
 #include "base/threading/thread_checker.h"
 #include "media/base/video_decoder.h"
 #include "media/base/video_decoder_config.h"
-#include "media/base/video_frame_pool.h"
 #include "media/ffmpeg/ffmpeg_deleters.h"
 
 struct AVCodecContext;
@@ -26,12 +25,16 @@ class SingleThreadTaskRunner;
 namespace media {
 
 class DecoderBuffer;
+class GpuMemoryBufferVideoFramePool;
+class HybridVideoFramePool;
 
 class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
  public:
   static bool IsCodecSupported(VideoCodec codec);
 
   FFmpegVideoDecoder();
+  explicit FFmpegVideoDecoder(
+      std::unique_ptr<GpuMemoryBufferVideoFramePool> gpu_video_frame_pool);
   ~FFmpegVideoDecoder() override;
 
   // Allow decoding of individual NALU. Entire frames are required by default.
@@ -88,7 +91,7 @@ class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
 
   VideoDecoderConfig config_;
 
-  VideoFramePool frame_pool_;
+  std::unique_ptr<HybridVideoFramePool> hybrid_frame_pool_;
 
   bool decode_nalus_;