Add some Mojo C thunks used by cc when turning on impl-side painting.

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 44 matching lines @@
   deps = [
     ":system_impl_private_api",
     "//testing/gtest",
   ]
 
   mojo_sdk_deps = [ "mojo/public/c/system" ]
 }
 
 mojo_sdk_source_set("gles2") {
   sources = [
+    "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_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_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_occlusion_query_ext_thunks.cc",
     "gles2_impl_occlusion_query_ext_thunks.h",
     "gles2_impl_thunks.cc",
     "gles2_impl_thunks.h",
     "gles2_thunks.cc",
     "gles2_thunks.h",
   ]
 
   defines = [ "MOJO_GLES2_IMPLEMENTATION" ]
 
   configs = [ "//third_party/khronos:khronos_headers" ]
 
   mojo_sdk_deps = [
     "mojo/public/c/gles2:headers",
     "mojo/public/c/environment",
     "mojo/public/c/system",
   ]
 
   if (is_mac) {
     # TODO(GYP): Make it a run-path dependent library.
     # 'DYLIB_INSTALL_NAME_BASE': '@loader_path',
   }
 }