cc: Use the correct internal format for glCopyTexImage2D calls.

cc/output/output_surface.h

 // Copyright 2012 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.
 
 #ifndef CC_OUTPUT_OUTPUT_SURFACE_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_H_
 
 #include <deque>
 #include <memory>
 
@@ skipping 114 matching lines @@
 
   virtual void Reshape(const gfx::Size& size, float scale_factor, bool alpha);
   gfx::Size SurfaceSize() const { return surface_size_; }
   float device_scale_factor() const { return device_scale_factor_; }
 
   // If supported, this causes a ReclaimResources for all resources that are
   // currently in use.
   virtual void ForceReclaimResources() {}
 
   virtual void BindFramebuffer();
+  // Gives the GL internal format that should be used for calling CopyTexImage2D
+  // when the framebuffer is bound via BindFramebuffer().
+  virtual uint32_t GetFramebufferCopyTextureFormat() = 0;
 
   // The implementation may destroy or steal the contents of the CompositorFrame
   // passed in (though it will not take ownership of the CompositorFrame
   // itself). For successful swaps, the implementation must call
   // OutputSurfaceClient::DidSwapBuffers() and eventually
   // DidSwapBuffersComplete().
   virtual void SwapBuffers(CompositorFrame* frame) = 0;
   virtual void OnSwapBuffersComplete();
 
   // Called by subclasses after receiving a response from the gpu process to a
@@ skipping 57 matching lines @@
   bool external_stencil_test_enabled_ = false;
 
   base::WeakPtrFactory<OutputSurface> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OutputSurface);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_H_