Wait on fence before reusing DXVA picture buffer

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 5f37ddf9844b3fdecf6ca4f2bc50c448527fe5ee..7624202fa9115a394b5bd7643525dd6be02eb896 100644
--- a/content/common/gpu/media/dxva_video_decode_accelerator_win.h
+++ b/content/common/gpu/media/dxva_video_decode_accelerator_win.h
@@ -237,6 +237,10 @@ class CONTENT_EXPORT DXVAVideoDecodeAccelerator
                     int picture_buffer_id,
                     int input_buffer_id);
 
+  // Polls to wait for GPU commands to be finished on the picture buffer
+  // before reusing it.
+  void WaitForOutputBuffer(int32_t picture_buffer_id, int count);
+
   // Initializes the DX11 Video format converter media types.
   // Returns true on success.
   bool InitializeDX11VideoFormatConverterMediaType(int width, int height);