enable fp16 when --enable-hdr-output is on

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 a4336fb9debfaa9868a785a68749bb7689b279c9..df3ff4dc69286cc12ca4e479b2b2d4fa9c546eae 100644
--- a/media/gpu/dxva_video_decode_accelerator_win.h
+++ b/media/gpu/dxva_video_decode_accelerator_win.h
@@ -538,6 +538,9 @@ class MEDIA_GPU_EXPORT DXVAVideoDecodeAccelerator
   // Color spaced used when initializing the dx11 format converter.
   gfx::ColorSpace dx11_converter_color_space_;
 
+  // Outputs from the dx11 format converter will be in this color space.
+  gfx::ColorSpace dx11_converter_output_color_space_;
+
   // Set to true if we are sharing ANGLE's device.
   bool using_angle_device_;