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

content/common/gpu/media/gpu_video_decode_accelerator.cc

Index: content/common/gpu/media/gpu_video_decode_accelerator.cc
diff --git a/content/common/gpu/media/gpu_video_decode_accelerator.cc b/content/common/gpu/media/gpu_video_decode_accelerator.cc
index df8ec5bc0ec8c72f35ba64dea56b0f1952197b62..59cad8c9ca2f1f0fb76a8f012bd4fd959a882b13 100644
--- a/content/common/gpu/media/gpu_video_decode_accelerator.cc
+++ b/content/common/gpu/media/gpu_video_decode_accelerator.cc
@@ -395,6 +395,14 @@ void GpuVideoDecodeAccelerator::OnAssignPictureBuffers(
         NotifyError(media::VideoDecodeAccelerator::INVALID_ARGUMENT);
         return;
       }
+
+      // FIXME: after moving to D3D11, remove this workaround. crbug.com/438691
+      GLenum format =
+          video_decode_accelerator_.get()->GetSurfaceInternalFormat();
+      if (format != GL_RGBA) {
+        texture_manager->SetLevelInfo(texture_ref, texture_target_, 0, format,
+                                      width, height, 1, 0, format, 0, false);
+      }
     }
     uint32 service_texture_id;
     if (!command_decoder->GetServiceTextureId(