gpu: Add IOSurface backed GpuMemoryBuffer implementation.

ui/gl/gl.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
 
   'targets': [
@@ skipping 236 matching lines @@
           'link_settings': {
             'libraries': [
               '-ldwmapi.lib',
             ],
           },
         }],
         ['OS=="mac"', {
           'sources': [
             'gl_context_cgl.cc',
             'gl_context_cgl.h',
+            'gl_image_io_surface.cc',
+            'gl_image_io_surface.h',
             'gl_surface_cgl.cc',
             'gl_surface_cgl.h',
             'gl_context_nsview.mm',
             'gl_context_nsview.h',
             'gl_surface_nsview.mm',
             'gl_surface_nsview.h',
           ],
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
@@ skipping 85 matching lines @@
           'variables': {
             'jni_gen_package': 'ui/gl',
             'jni_generator_ptr_type': 'long',
           },
           'includes': [ '../../build/jni_generator.gypi' ],
         },
       ],
     }],
   ],
 }