Add prototype D3D11VideoDecodeAccelerator.

media/gpu/gpu_video_decode_accelerator_factory.h

Index: media/gpu/gpu_video_decode_accelerator_factory.h
diff --git a/media/gpu/gpu_video_decode_accelerator_factory.h b/media/gpu/gpu_video_decode_accelerator_factory.h
index 29d1d7aa1886613c0b1c95119f5b6b86370a9411..5f5a9d2ecdb5baa9add8d378e27b05f08c37f841 100644
--- a/media/gpu/gpu_video_decode_accelerator_factory.h
+++ b/media/gpu/gpu_video_decode_accelerator_factory.h
@@ -86,6 +86,9 @@ class MEDIA_GPU_EXPORT GpuVideoDecodeAcceleratorFactory {
       const GetGLES2DecoderCallback& get_gles2_decoder_cb);
 
 #if defined(OS_WIN)
+  std::unique_ptr<VideoDecodeAccelerator> CreateD3D11VDA(
+      const gpu::GpuDriverBugWorkarounds& workarounds,
+      const gpu::GpuPreferences& gpu_preferences) const;
   std::unique_ptr<VideoDecodeAccelerator> CreateDXVAVDA(
       const gpu::GpuDriverBugWorkarounds& workarounds,
       const gpu::GpuPreferences& gpu_preferences) const;