Make GL calls go through subclassable class.

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 35 matching lines @@
         'gl_context_linux.cc',
         'gl_context_mac.mm',
         'gl_context_osmesa.cc',
         'gl_context_osmesa.h',
         'gl_context_stub.cc',
         'gl_context_stub.h',
         'gl_context_win.cc',
         'gl_export.h',
         'gl_fence.cc',
         'gl_fence.h',
+        'gl_gl_api_implementation.cc',
+        'gl_gl_api_implementation.h',
         'gl_image.cc',
         'gl_image.h',
         'gl_image_android.cc',
         'gl_image_linux.cc',
         'gl_image_mac.cc',
         'gl_image_stub.cc',
         'gl_image_stub.h',
         'gl_image_win.cc',
         'gl_implementation.cc',
         'gl_implementation.h',
         'gl_implementation_android.cc',
         'gl_implementation_linux.cc',
         'gl_implementation_mac.cc',
         'gl_implementation_win.cc',
         'gl_interface.cc',
         'gl_interface.h',
+        'gl_osmesa_api_implementation.cc',
+        'gl_osmesa_api_implementation.h',
         'gl_share_group.cc',
         'gl_share_group.h',
         'gl_surface.cc',
         'gl_surface.h',
         'gl_surface_android.cc',
         'gl_surface_android.h',
         'gl_surface_linux.cc',
         'gl_surface_mac.cc',
         'gl_surface_stub.cc',
         'gl_surface_stub.h',
@@ skipping 25 matching lines @@
             '<(DEPTH)/third_party/khronos/GLES2/gl2ext.h',
             '<(DEPTH)/third_party/khronos/EGL/eglext.h',
             '<(DEPTH)/third_party/mesa/MesaLib/include/GL/glext.h',
             '<(DEPTH)/third_party/mesa/MesaLib/include/GL/glx.h',
             '<(DEPTH)/third_party/mesa/MesaLib/include/GL/glxext.h',
             '<(DEPTH)/third_party/mesa/MesaLib/include/GL/wglext.h',
           ],
           'outputs': [
             '<(gl_binding_output_dir)/gl_bindings_autogen_egl.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_egl.h',
+            '<(gl_binding_output_dir)/gl_bindings_autogen_api_egl.h',
             '<(gl_binding_output_dir)/gl_bindings_autogen_gl.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_gl.h',
+            '<(gl_binding_output_dir)/gl_bindings_autogen_api_gl.h',
             '<(gl_binding_output_dir)/gl_bindings_autogen_glx.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_glx.h',
+            '<(gl_binding_output_dir)/gl_bindings_autogen_api_glx.h',
             '<(gl_binding_output_dir)/gl_bindings_autogen_mock.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_osmesa.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_osmesa.h',
+            '<(gl_binding_output_dir)/gl_bindings_autogen_api_osmesa.h',
             '<(gl_binding_output_dir)/gl_bindings_autogen_wgl.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_wgl.h',
+            '<(gl_binding_output_dir)/gl_bindings_autogen_api_wgl.h',
           ],
           'action': [
             'python',
             'generate_bindings.py',
             '<(gl_binding_output_dir)',
           ],
         },
       ],
       'conditions': [
         ['OS != "mac"', {
           'sources': [
             'egl_util.cc',
             'egl_util.h',
             'gl_context_egl.cc',
             'gl_context_egl.h',
             'gl_surface_egl.cc',
             'gl_surface_egl.h',
+            'gl_egl_api_implementation.cc',
+            'gl_egl_api_implementation.h',
             '<(gl_binding_output_dir)/gl_bindings_autogen_egl.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_egl.h',
           ],
           'include_dirs': [
             '<(DEPTH)/third_party/angle/include',
           ],
         }],
         ['use_x11 == 1', {
           'sources': [
             'gl_context_glx.cc',
             'gl_context_glx.h',
+            'gl_glx_api_implementation.cc',
+            'gl_glx_api_implementation.h',
             'gl_image_glx.cc',
             'gl_image_glx.h',
             'gl_surface_glx.cc',
             'gl_surface_glx.h',
+            'gl_egl_api_implementation.cc',
+            'gl_egl_api_implementation.h',
             '<(gl_binding_output_dir)/gl_bindings_autogen_glx.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_glx.h',
           ],
           'all_dependent_settings': {
             'defines': [
               'GL_GLEXT_PROTOTYPES',
             ],
           },
           'link_settings': {
             'libraries': [
               '-lX11',
               '-lXcomposite',
             ],
           },
         }],
         ['OS=="win"', {
           'sources': [
             'gl_context_wgl.cc',
             'gl_context_wgl.h',
+            'gl_egl_api_implementation.cc',
+            'gl_egl_api_implementation.h',
             'gl_surface_wgl.cc',
             'gl_surface_wgl.h',
+            'gl_wgl_api_implementation.cc',
+            'gl_wgl_api_implementation.h',
             '<(gl_binding_output_dir)/gl_bindings_autogen_wgl.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_wgl.h',
           ],
         }],
         ['OS=="mac"', {
           'sources': [
             'gl_context_cgl.cc',
             'gl_context_cgl.h',
             'gl_surface_cgl.cc',
             'gl_surface_cgl.h',
@@ skipping 11 matching lines @@
             'gl_surface_nsview.mm',
             'gl_surface_nsview.h',
           ],
         }],
         ['OS=="android"', {
           'sources': [
             'android_native_window.cc',
             'android_native_window.h',
           ],
           'sources!': [
+            'gl_egl_api_implementation.cc',
+            'gl_egl_api_implementation.h',
             '<(gl_binding_output_dir)/gl_bindings_autogen_osmesa.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_osmesa.h',
             'gl_context_osmesa.cc',
             'system_monitor_posix.cc',
           ],
           'defines': [
             'GL_GLEXT_PROTOTYPES',
             'EGL_EGLEXT_PROTOTYPES',
           ],
         }],
       ],
     },
   ],
 }