Refactor GL surface format handling

gpu/ipc/service/image_transport_surface_overlay_mac.h

 // Copyright 2015 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 GPU_IPC_SERVICE_IMAGE_TRANSPORT_SURFACE_OVERLAY_MAC_H_
 #define GPU_IPC_SERVICE_IMAGE_TRANSPORT_SURFACE_OVERLAY_MAC_H_
 
 #include <list>
 #include <memory>
 #include <vector>
@@ skipping 21 matching lines @@
 
 namespace gpu {
 
 class ImageTransportSurfaceOverlayMac : public gl::GLSurface,
                                         public ui::GpuSwitchingObserver {
  public:
   explicit ImageTransportSurfaceOverlayMac(
       base::WeakPtr<ImageTransportSurfaceDelegate> delegate);
 
   // GLSurface implementation
-  bool Initialize(gl::GLSurface::Format format) override;
+  bool Initialize(gl::GLSurfaceFormat format) override;
   void Destroy() override;
   bool Resize(const gfx::Size& size,
               float scale_factor,
               bool has_alpha) override;
   bool IsOffscreen() override;
   gfx::SwapResult SwapBuffers() override;
   gfx::SwapResult PostSubBuffer(int x, int y, int width, int height) override;
   bool SupportsPostSubBuffer() override;
   gfx::Size GetSize() override;
   void* GetHandle() override;
@@ skipping 45 matching lines @@
   base::ScopedTypeRef<CGLContextObj> fence_context_obj_;
 
   // The renderer ID that all contexts made current to this surface should be
   // targeting.
   GLint gl_renderer_id_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_SERVICE_IMAGE_TRANSPORT_SURFACE_OVERLAY_MAC_H_