Revert of Mac Overlays: Add GPU back-pressure

content/common/gpu/image_transport_surface_calayer_mac.mm

 // Copyright 2014 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 "content/common/gpu/image_transport_surface_calayer_mac.h"
 
 #include <IOSurface/IOSurface.h>
 #include <OpenGL/CGLRenderers.h>
 #include <OpenGL/CGLIOSurface.h>
 
 #include "base/command_line.h"
 #include "base/mac/sdk_forward_declarations.h"
 #include "base/trace_event/trace_event.h"
 #include "gpu/config/gpu_info_collector.h"
 #include "ui/accelerated_widget_mac/surface_handle_types.h"
 #include "ui/base/cocoa/animation_utils.h"
 #include "ui/gfx/geometry/dip_util.h"
 #include "ui/gfx/geometry/size_conversions.h"
+#include "ui/gl/gl_gl_api_implementation.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/gl/gpu_switching_manager.h"
-#include "ui/gl/scoped_api.h"
 
 namespace {
 const size_t kFramesToKeepCAContextAfterDiscard = 2;
 const size_t kCanDrawFalsesBeforeSwitchFromAsync = 4;
 const base::TimeDelta kMinDeltaToSwitchToAsync =
     base::TimeDelta::FromSecondsD(1. / 15.);
 
 
 }  // namespace
 
@@ skipping 608 matching lines @@
   if (ca_opengl_layer_) {
     [ca_opengl_layer_ resetStorageProvider];
     // If we are providing back-pressure by waiting for a draw, that draw will
     // now never come, so release the pressure now.
     UnblockBrowserIfNeeded();
     ca_opengl_layer_.reset();
   }
 }
 
 }  //  namespace content