Use C OpenGL interface in mojo::GLContext

mojo/public/platform/native/BUILD.gn

 # 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.
 
 assert(!defined(is_nacl) || !is_nacl)
 
 import("../../mojo_sdk.gni")
 
 mojo_sdk_source_set("system") {
   sources = [
@@ skipping 50 matching lines @@
 }
 
 mojo_sdk_source_set("gles2") {
   sources = [
     "gles2_impl_chromium_bind_uniform_location_thunks.cc",
     "gles2_impl_chromium_bind_uniform_location_thunks.h",
     "gles2_impl_chromium_copy_texture_thunks.cc",
     "gles2_impl_chromium_copy_texture_thunks.h",
     "gles2_impl_chromium_image_thunks.cc",
     "gles2_impl_chromium_image_thunks.h",
+    "gles2_impl_chromium_map_sub_thunks.cc",
+    "gles2_impl_chromium_map_sub_thunks.h",
     "gles2_impl_chromium_miscellaneous_thunks.cc",
     "gles2_impl_chromium_miscellaneous_thunks.h",
     "gles2_impl_chromium_pixel_transfer_buffer_object_thunks.cc",
     "gles2_impl_chromium_pixel_transfer_buffer_object_thunks.h",
     "gles2_impl_chromium_resize_thunks.cc",
     "gles2_impl_chromium_resize_thunks.h",
-    "gles2_impl_chromium_sub_image_thunks.cc",
-    "gles2_impl_chromium_sub_image_thunks.h",
     "gles2_impl_chromium_sync_point_thunks.cc",
     "gles2_impl_chromium_sync_point_thunks.h",
     "gles2_impl_chromium_texture_mailbox_thunks.cc",
     "gles2_impl_chromium_texture_mailbox_thunks.h",
     "gles2_impl_ext_debug_marker_thunks.cc",
     "gles2_impl_ext_debug_marker_thunks.h",
     "gles2_impl_occlusion_query_ext_thunks.cc",
     "gles2_impl_occlusion_query_ext_thunks.h",
     "gles2_impl_oes_vertex_array_object_thunks.cc",
     "gles2_impl_oes_vertex_array_object_thunks.h",
@@ skipping 33 matching lines @@
 }
 
 mojo_sdk_source_set("mgl_onscreen_thunks") {
   sources = [
     "mgl_onscreen_thunks.c",
     "mgl_onscreen_thunks.h",
   ]
 
   mojo_sdk_deps = [ "mojo/public/c/gpu:MGL_onscreen" ]
 }