cc: Use the correct internal format for glCopyTexImage2D calls.

content/renderer/gpu/compositor_output_surface.h

Index: content/renderer/gpu/compositor_output_surface.h
diff --git a/content/renderer/gpu/compositor_output_surface.h b/content/renderer/gpu/compositor_output_surface.h
index a7b3273f2d93d9598ef7a96a477a549ba5c22c3b..b8b85cba731c03b89a61d80b35000e04bfdfb094 100644
--- a/content/renderer/gpu/compositor_output_surface.h
+++ b/content/renderer/gpu/compositor_output_surface.h
@@ -58,6 +58,8 @@ class CompositorOutputSurface
   bool BindToClient(cc::OutputSurfaceClient* client) override;
   void DetachFromClient() override;
   void SwapBuffers(cc::CompositorFrame* frame) override;
+  void BindFramebuffer() override;
+  uint32_t GetFramebufferCopyTextureFormat() override;
 
  protected:
   uint32_t output_surface_id_;