Refactor GL surface format handling

gpu/ipc/service/image_transport_surface_overlay_mac.mm

 // 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.
 
 #include "gpu/ipc/service/image_transport_surface_overlay_mac.h"
 
 #include <CoreGraphics/CoreGraphics.h>
 #include <IOSurface/IOSurface.h>
 #include <OpenGL/CGLRenderers.h>
 #include <OpenGL/CGLTypes.h>
@@ skipping 73 matching lines @@
 
 ImageTransportSurfaceOverlayMac::~ImageTransportSurfaceOverlayMac() {
   ui::GpuSwitchingManager::GetInstance()->RemoveObserver(this);
   if (delegate_.get()) {
     delegate_->SetLatencyInfoCallback(
         base::Callback<void(const std::vector<ui::LatencyInfo>&)>());
   }
   Destroy();
 }
 
-bool ImageTransportSurfaceOverlayMac::Initialize(gl::GLSurface::Format format) {
+bool ImageTransportSurfaceOverlayMac::Initialize(gl::GLSurfaceFormat format) {
   delegate_->SetLatencyInfoCallback(
       base::Bind(&ImageTransportSurfaceOverlayMac::SetLatencyInfo,
                  base::Unretained(this)));
 
   // Create the CAContext to send this to the GPU process, and the layer for
   // the context.
   if (use_remote_layer_api_) {
     CGSConnectionID connection_id = CGSMainConnectionID();
     ca_context_.reset([
         [CAContext contextWithCGSConnection:connection_id options:@{}] retain]);
@@ skipping 283 matching lines @@
   gl_renderer_id_ = context_renderer_id & kCGLRendererIDMatchingMask;
 
   // Post a task holding a reference to the new GL context. The reason for
   // this is to avoid creating-then-destroying the context for every image
   // transport surface that is observing the GPU switch.
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(&IOSurfaceContextNoOp, context_on_new_gpu));
 }
 
 }  // namespace gpu