Introduce GLStubApi

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 83 matching lines @@
         'gl_state_restorer.cc',
         'gl_state_restorer.h',
         'gl_surface.cc',
         'gl_surface.h',
         'gl_surface_osmesa.cc',
         'gl_surface_osmesa.h',
         'gl_surface_overlay.cc',
         'gl_surface_overlay.h',
         'gl_surface_stub.cc',
         'gl_surface_stub.h',
+        "gl_stub_api.cc",
+        "gl_stub_api.h",
+        "gl_stub_api_base.h",
+        "gl_stub_autogen_gl.cc",
+        "gl_stub_autogen_gl.h",
         'gl_switches.cc',
         'gl_switches.h',
         'gl_version_info.cc',
         'gl_version_info.h',
         'gpu_switching_manager.cc',
         'gpu_switching_manager.h',
         'gpu_switching_observer.h',
         'gpu_timing.cc',
         'gpu_timing.h',
         'scoped_api.cc',
@@ skipping 266 matching lines @@
           ],
           'variables': {
             'jni_gen_package': 'ui/gl',
           },
           'includes': [ '../../build/jni_generator.gypi' ],
         },
       ],
     }],
   ],
 }