cc: Use the correct internal format for glCopyTexImage2D calls.

components/mus/surfaces/direct_output_surface.cc

 // Copyright 2014 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 "components/mus/surfaces/direct_output_surface.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 54 matching lines @@
 
   gpu::SyncToken sync_token;
   gl->GenUnverifiedSyncTokenCHROMIUM(fence_sync, sync_token.GetData());
 
   context_provider_->ContextSupport()->SignalSyncToken(
       sync_token, base::Bind(&OutputSurface::OnSwapBuffersComplete,
                              weak_ptr_factory_.GetWeakPtr()));
   client_->DidSwapBuffers();
 }
 
+uint32_t DirectOutputSurface::GetFramebufferCopyTextureFormat() {
+  // TODO(danakj): What attributes are used for the default framebuffer here?
+  // Can it have alpha? SurfacesContextProvider doesn't take any attributes.
+  return GL_RGB;
+}
+
 }  // namespace mus