Invalidate DXVA IMFTransform on Flush()

media/gpu/dxva_video_decode_accelerator_win.h

Index: media/gpu/dxva_video_decode_accelerator_win.h
diff --git a/media/gpu/dxva_video_decode_accelerator_win.h b/media/gpu/dxva_video_decode_accelerator_win.h
index dc02f98c95c6a2bcda2f9aaf2126ce3437f6fa6c..6faa21773dd3304d8fe2125534dd239e46596afb 100644
--- a/media/gpu/dxva_video_decode_accelerator_win.h
+++ b/media/gpu/dxva_video_decode_accelerator_win.h
@@ -238,8 +238,9 @@ class MEDIA_GPU_EXPORT DXVAVideoDecodeAccelerator
   void StopOnError(VideoDecodeAccelerator::Error error);
 
   // Transitions the decoder to the uninitialized state. The decoder will stop
-  // accepting requests in this state.
-  void Invalidate();
+  // accepting requests in this state. When invalidating for a config change,
+  // only the decoder needs to be destroyed - other things can stick around.
+  void Invalidate(bool for_config_change);
 
   // Stop and join on the decoder thread.
   void StopDecoderThread();