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

mojo/public/platform/native/mgl_signal_sync_point_thunks.h

-// 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.
-
-#ifndef MOJO_PUBLIC_PLATFORM_NATIVE_MGL_SIGNAL_SYNC_POINT_THUNKS_H_
-#define MOJO_PUBLIC_PLATFORM_NATIVE_MGL_SIGNAL_SYNC_POINT_THUNKS_H_
-
-#include <MGL/mgl_signal_sync_point.h>
-#include <stddef.h>
-
-// Structure used to bind the MGL signal sync point interface DSO to those
-// of the embedder.
-//
-// This is the ABI between the embedder and the DSO. It can only have new
-// functions added to the end. No other changes are supported.
-#pragma pack(push, 8)
-struct MGLSignalSyncPointThunks {
-  size_t size;  // Should be set to sizeof(MGLSignalSyncPointThunks).
-
-  void (*MGLSignalSyncPoint)(uint32_t sync_point,
-                             MGLSignalSyncPointCallback callback,
-                             void* lost_callback_closure);
-};
-#pragma pack(pop)
-
-#ifdef __cplusplus
-// Intended to be called from the embedder. Returns an object initialized to
-// contain pointers to each of the embedder's MGLSignalSyncPointThunks
-// functions.
-inline struct MGLSignalSyncPointThunks MojoMakeMGLSignalSyncPointThunks() {
-  struct MGLSignalSyncPointThunks mgl_thunks = {
-      sizeof(struct MGLSignalSyncPointThunks), MGLSignalSyncPoint,
-  };
-
-  return mgl_thunks;
-}
-#endif  // __cplusplus
-
-// Use this type for the function found by dynamically discovering it in
-// a DSO linked with mojo_system. For example:
-// MojoSetMGLSignalSyncPointThunksFn mojo_set_gles2_thunks_fn =
-//     reinterpret_cast<MojoSetMGLSignalSyncPointThunksFn>(
-//         app_library.GetFunctionPointer("MojoSetMGLSignalSyncPointThunks"));
-// The expected size of |mgl_thunks| is returned.
-// The contents of |mgl_thunks| are copied.
-typedef size_t (*MojoSetMGLSignalSyncPointThunksFn)(
-    const struct MGLSignalSyncPointThunks* mgl_signal_sync_point_thunks);
-
-#endif  // MOJO_PUBLIC_PLATFORM_NATIVE_MGL_SIGNAL_SYNC_POINT_THUNKS_H_