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

media/video/video_decode_accelerator.cc

 // Copyright (c) 2011 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.
 
 #include "media/video/video_decode_accelerator.h"
 
+#include <GLES2/gl2.h>
 #include "base/logging.h"
 
 namespace media {
 
 VideoDecodeAccelerator::~VideoDecodeAccelerator() {}
 
 bool VideoDecodeAccelerator::CanDecodeOnIOThread() {
   // GPU process subclasses must override this.
   LOG(FATAL) << "This should only get called in the GPU process";
   return false;  // not reached
 }
 
+GLenum VideoDecodeAccelerator::GetSurfaceInternalFormat() const {
+  return GL_RGBA;
+}
+
 } // namespace media
 
 namespace base {
 
 void DefaultDeleter<media::VideoDecodeAccelerator>::operator()(
     void* video_decode_accelerator) const {
   static_cast<media::VideoDecodeAccelerator*>(video_decode_accelerator)->
       Destroy();
 }
 
 }  // namespace base