Add the UI compositor to the Mac build

content/browser/aura/resize_lock.cc

-// Copyright 2013 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 "content/browser/aura/resize_lock.h"
-
-namespace content {
-
-ResizeLock::ResizeLock(const gfx::Size new_size, bool defer_compositor_lock)
-    : new_size_(new_size),
-      defer_compositor_lock_(defer_compositor_lock) {
-  if (!defer_compositor_lock_)
-    LockCompositor();
-}
-
-ResizeLock::~ResizeLock() {
-  UnlockCompositor();
-}
-
-bool ResizeLock::GrabDeferredLock() {
-  if (!defer_compositor_lock_)
-    return false;
-  LockCompositor();
-  return true;
-}
-
-void ResizeLock::UnlockCompositor() {
-  defer_compositor_lock_ = false;
-}
-
-void ResizeLock::LockCompositor() {
-  defer_compositor_lock_ = false;
-}
-
-}  // namespace content