cc: Use the correct internal format for glCopyTexImage2D calls.

cc/test/pixel_test_output_surface.cc

 // Copyright 2013 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 "cc/test/pixel_test_output_surface.h"
 
 #include <utility>
 
 #include "cc/output/output_surface_client.h"
+#include "third_party/khronos/GLES2/gl2.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 
 PixelTestOutputSurface::PixelTestOutputSurface(
     scoped_refptr<ContextProvider> context_provider,
     scoped_refptr<ContextProvider> worker_context_provider,
     bool flipped_output_surface)
     : OutputSurface(std::move(context_provider),
                     std::move(worker_context_provider),
@@ skipping 27 matching lines @@
 
 bool PixelTestOutputSurface::HasExternalStencilTest() const {
   return external_stencil_test_;
 }
 
 void PixelTestOutputSurface::SwapBuffers(CompositorFrame* frame) {
   PostSwapBuffersComplete();
   client_->DidSwapBuffers();
 }
 
+uint32_t PixelTestOutputSurface::GetFramebufferCopyTextureFormat() {
+  // This format will work if the |context_provider| has an RGB or RGBA
+  // framebuffer. For now assume tests do not want/care about alpha in
+  // the root render pass.
+  return GL_RGB;
+}
+
 }  // namespace cc