gpu: Make GPU command decoder know right format of a GPU video texture in Win.

media/video/video_decode_accelerator.h

Index: media/video/video_decode_accelerator.h
diff --git a/media/video/video_decode_accelerator.h b/media/video/video_decode_accelerator.h
index 4df3b1c915836ef4dee55690d6a6880c3d1b24de..547e1bb12de64079a44b8d7be08c944af23d1933 100644
--- a/media/video/video_decode_accelerator.h
+++ b/media/video/video_decode_accelerator.h
@@ -13,6 +13,8 @@
 #include "media/video/picture.h"
 #include "ui/gfx/size.h"
 
+typedef unsigned int GLenum;
+
 namespace media {
 
 // Video decoder interface.
@@ -143,6 +145,10 @@ class MEDIA_EXPORT VideoDecodeAccelerator {
   // the first time so it can be cleared.
   virtual bool CanDecodeOnIOThread();
 
+  // Windows creates a BGRA texture.
+  // TODO(dshwang): after moving to D3D11, remove this. crbug.com/438691
+  virtual GLenum GetSurfaceInternalFormat() const;
+
  protected:
   // Do not delete directly; use Destroy() or own it with a scoped_ptr, which
   // will Destroy() it properly by default.