Mac: Clean up ifdefs in output surface

content/content_browser.gypi

 # Copyright (c) 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../cc/cc.gyp:cc',
     '../cc/cc.gyp:cc_surfaces',
     '../components/components.gyp:display_compositor',
@@ skipping 1747 matching lines @@
       'browser/renderer_host/p2p/socket_host_throttler.cc',
       'browser/renderer_host/p2p/socket_host_throttler.h',
       'browser/renderer_host/p2p/socket_host_udp.cc',
       'browser/renderer_host/p2p/socket_host_udp.h',
     ],
     'compositor_browser_sources': [
       'browser/compositor/browser_compositor_output_surface.cc',
       'browser/compositor/browser_compositor_output_surface.h',
       'browser/compositor/gpu_browser_compositor_output_surface.cc',
       'browser/compositor/gpu_browser_compositor_output_surface.h',
+      'browser/compositor/gpu_output_surface_mac.mm',
+      'browser/compositor/gpu_output_surface_mac.h',
       'browser/compositor/gpu_process_transport_factory.cc',
       'browser/compositor/gpu_process_transport_factory.h',
       'browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc',
       'browser/compositor/gpu_surfaceless_browser_compositor_output_surface.h',
       'browser/compositor/image_transport_factory.cc',
       'browser/compositor/image_transport_factory.h',
       'browser/compositor/offscreen_browser_compositor_output_surface.cc',
       'browser/compositor/offscreen_browser_compositor_output_surface.h',
       'browser/compositor/owned_mailbox.cc',
       'browser/compositor/owned_mailbox.h',
@@ skipping 425 matching lines @@
       ],
     }],
     ['OS != "mac" and OS != "android"', {
       'sources!': [
         'browser/gpu/gpu_surface_tracker.cc',
         'browser/gpu/gpu_surface_tracker.h',
       ],
     }],
   ],
 }