Add a flag to enable remote CoreAnimation API.

content/common/gpu/image_transport_surface_fbo_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_fbo_mac.h"
 
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/gpu/image_transport_surface_calayer_mac.h"
 #include "content/common/gpu/image_transport_surface_iosurface_mac.h"
+#include "ui/base/cocoa/remote_layer_api.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface_osmesa.h"
 
 namespace content {
 
 ImageTransportSurfaceFBO::ImageTransportSurfaceFBO(
     GpuChannelManager* manager,
     GpuCommandBufferStub* stub,
     gfx::PluginWindowHandle handle)
     : backbuffer_suggested_allocation_(true),
       frontbuffer_suggested_allocation_(true),
       fbo_id_(0),
       texture_id_(0),
       depth_stencil_renderbuffer_id_(0),
       has_complete_framebuffer_(false),
       context_(NULL),
       scale_factor_(1.f),
       made_current_(false),
       is_swap_buffers_pending_(false),
       did_unschedule_(false) {
-  // TODO(ccameron): If the remote layer API is supported on this system,
-  // use a CALayerStorageProvider instead of an IOSurfaceStorageProvider.
-  storage_provider_.reset(new IOSurfaceStorageProvider(this));
+  if (ui::RemoteLayerAPISupported())
+    storage_provider_.reset(new CALayerStorageProvider(this));
+  else
+    storage_provider_.reset(new IOSurfaceStorageProvider(this));
   helper_.reset(new ImageTransportHelper(this, manager, stub, handle));
 }
 
 ImageTransportSurfaceFBO::~ImageTransportSurfaceFBO() {
 }
 
 bool ImageTransportSurfaceFBO::Initialize() {
   // Only support IOSurfaces if the GL implementation is the native desktop GL.
   // IO surfaces will not work with, for example, OSMesa software renderer
   // GL contexts.
@@ skipping 282 matching lines @@
     return;
   }
 
   has_complete_framebuffer_ = true;
 
   glBindTexture(GL_TEXTURE_RECTANGLE_ARB, previous_texture_id);
   // The FBO remains bound for this GL context.
 }
 
 }  // namespace content