Update from https://crrev.com/320931

cc/base/latency_info_swap_promise_monitor.h

-// 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 "base/compiler_specific.h"
-#include "cc/base/swap_promise_monitor.h"
-
-#ifndef CC_BASE_LATENCY_INFO_SWAP_PROMISE_MONITOR_H_
-#define CC_BASE_LATENCY_INFO_SWAP_PROMISE_MONITOR_H_
-
-namespace ui {
-struct LatencyInfo;
-}  // namespace ui
-
-namespace cc {
-
-// A LatencyInfoSwapPromiseMonitor queues a LatencyInfoSwapPromise into
-// LayerTreeHost or LayerTreeHostImpl if there is compositor state change
-// while it is being mointored.
-class CC_EXPORT LatencyInfoSwapPromiseMonitor : public SwapPromiseMonitor {
- public:
-  LatencyInfoSwapPromiseMonitor(ui::LatencyInfo* latency,
-                                LayerTreeHost* layer_tree_host,
-                                LayerTreeHostImpl* layer_tree_host_impl);
-  ~LatencyInfoSwapPromiseMonitor() override;
-
-  void OnSetNeedsCommitOnMain() override;
-  void OnSetNeedsRedrawOnImpl() override;
-  void OnForwardScrollUpdateToMainThreadOnImpl() override;
-
- private:
-  ui::LatencyInfo* latency_;
-};
-
-}  // namespace cc
-
-#endif  // CC_BASE_LATENCY_INFO_SWAP_PROMISE_MONITOR_H_