Fix the frame freezing issue observed during a config change in the H.264 decoder on Windows

media/gpu/dxva_video_decode_accelerator_win.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_GPU_DXVA_VIDEO_DECODE_ACCELERATOR_WIN_H_
 #define MEDIA_GPU_DXVA_VIDEO_DECODE_ACCELERATOR_WIN_H_
 
 #include <d3d11.h>
 #include <d3d9.h>
 #include <initguid.h>
@@ skipping 471 matching lines @@
   // The media foundation H.264 decoder has problems handling changes like
   // resolution change, bitrate change etc. If we reinitialize the decoder
   // when these changes occur then, the decoder works fine. The
   // H264ConfigChangeDetector class provides functionality to check if the
   // stream configuration changed.
   std::unique_ptr<H264ConfigChangeDetector> config_change_detector_;
 
   // Contains the initialization parameters for the video.
   Config config_;
 
+  // Set to true if we are processing a video configuration change.
+  bool processing_config_changed_;
+
   // WeakPtrFactory for posting tasks back to |this|.
   base::WeakPtrFactory<DXVAVideoDecodeAccelerator> weak_this_factory_;
 
   // Function pointer for the MFCreateDXGIDeviceManager API.
   static CreateDXGIDeviceManager create_dxgi_device_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(DXVAVideoDecodeAccelerator);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_GPU_DXVA_VIDEO_DECODE_ACCELERATOR_WIN_H_