Expose CHROMIUM_texture_mailbox/sync_point stubs in mojo public headers

mojo/mojo_base.gyp

 # 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.
 
 # Essential components (and their tests) that are needed to build
 # Chrome should be here.  Other components that are useful only in
 # Mojo land like mojo_shell should be in mojo.gyp.
 {
   'includes': [
     'mojo_public.gypi',
@@ skipping 361 matching lines @@
         '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../gpu/gpu.gyp:command_buffer_client',
         '../gpu/gpu.gyp:command_buffer_common',
         '../gpu/gpu.gyp:gles2_cmd_helper',
         '../gpu/gpu.gyp:gles2_implementation',
         'mojo_environment_chromium',
         'mojo_gles2_bindings',
         '<(mojo_system_for_component)',
       ],
       'defines': [
+        'GLES2_USE_MOJO',
+        'GL_GLEXT_PROTOTYPES',
+        'MOJO_GLES2_IMPLEMENTATION',
         'MOJO_GLES2_IMPL_IMPLEMENTATION',
-        'MOJO_GLES2_IMPLEMENTATION',
-        'GLES2_USE_MOJO',
         'MOJO_USE_GLES2_IMPL'
       ],
       'direct_dependent_settings': {
         'defines': [
           'GLES2_USE_MOJO',
         ],
       },
       'sources': [
         'gles2/command_buffer_client_impl.cc',
         'gles2/command_buffer_client_impl.h',
@@ skipping 178 matching lines @@
             'mojo_js_unittests.isolate',
           ],
           'sources': [
             'mojo_js_unittests.isolate',
           ],
         },
       ],
     }],
   ]
 }