Make the fuchsia mojo/public repo the source of truth.

mojo/public/platform/native/mgl_thunks.c

-// Copyright 2015 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.
-
-#include "mojo/public/platform/native/mgl_thunks.h"
-
-#include <assert.h>
-
-#include "mojo/public/platform/native/thunk_export.h"
-
-static struct MGLThunks g_thunks = {0};
-
-MGLContext MGLCreateContext(MGLOpenGLAPIVersion version,
-                            MojoHandle command_buffer_handle,
-                            MGLContext share_group,
-                            MGLContextLostCallback lost_callback,
-                            void* lost_callback_closure,
-                            const struct MojoAsyncWaiter* async_waiter) {
-  assert(g_thunks.MGLCreateContext);
-  return g_thunks.MGLCreateContext(
-      version, command_buffer_handle, share_group, lost_callback,
-      lost_callback_closure, async_waiter);
-}
-
-void MGLDestroyContext(MGLContext context) {
-  assert(g_thunks.MGLDestroyContext);
-  g_thunks.MGLDestroyContext(context);
-}
-
-void MGLMakeCurrent(MGLContext context) {
-  assert(g_thunks.MGLMakeCurrent);
-  g_thunks.MGLMakeCurrent(context);
-}
-
-MGLContext MGLGetCurrentContext(void) {
-  assert(g_thunks.MGLGetCurrentContext);
-  return g_thunks.MGLGetCurrentContext();
-}
-
-THUNK_EXPORT size_t MojoSetMGLThunks(
-    const struct MGLThunks* mgl_thunks) {
-  if (mgl_thunks->size >= sizeof(g_thunks))
-    g_thunks = *mgl_thunks;
-  return sizeof(g_thunks);
-}
-
-MGLMustCastToProperFunctionPointerType MGLGetProcAddress(const char* name) {
-  assert(g_thunks.MGLGetProcAddress);
-  return g_thunks.MGLGetProcAddress(name);
-}