Use IDXGIKeyedMutex to synchronize between DXVA decoder and main context

content/common/gpu/media/dxva_video_decode_accelerator_win.h

Index: content/common/gpu/media/dxva_video_decode_accelerator_win.h
diff --git a/content/common/gpu/media/dxva_video_decode_accelerator_win.h b/content/common/gpu/media/dxva_video_decode_accelerator_win.h
index cbdc58ecfdd7ddfcbe9751b94ec3f00eda83ffee..627c0dbe87122275cf3d1a740fe3d2b069b4ed35 100644
--- a/content/common/gpu/media/dxva_video_decode_accelerator_win.h
+++ b/content/common/gpu/media/dxva_video_decode_accelerator_win.h
@@ -220,6 +220,8 @@ class CONTENT_EXPORT DXVAVideoDecodeAccelerator
   // is the sample containing the frame to be copied.
   void CopyTexture(ID3D11Texture2D* src_texture,
                    ID3D11Texture2D* dest_texture,
+                   base::win::ScopedComPtr<IDXGIKeyedMutex> dest_keyed_mutex,
+                   uint64_t keyed_mutex_value,
                    IMFSample* video_frame,
                    int picture_buffer_id,
                    int input_buffer_id);
@@ -360,6 +362,10 @@ class CONTENT_EXPORT DXVAVideoDecodeAccelerator
   // H/W decoding.
   bool use_dx11_;
 
+  // True if we should use DXGI keyed mutexes to synchronize between the two
+  // contexts.
+  bool use_keyed_mutex_;
+
   // Set to true if the DX11 video format converter input media types need to
   // be initialized. Defaults to true.
   bool dx11_video_format_converter_media_type_needs_init_;