cc: Implement unified BeginFrame on aura

ui/compositor/compositor_vsync_manager.cc

-// 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.
-
-#include "ui/compositor/compositor_vsync_manager.h"
-
-namespace ui {
-
-CompositorVSyncManager::CompositorVSyncManager()
-    : authoritative_vsync_interval_(base::TimeDelta::FromSeconds(0)) {
-}
-
-CompositorVSyncManager::~CompositorVSyncManager() {}
-
-void CompositorVSyncManager::SetAuthoritativeVSyncInterval(
-    base::TimeDelta interval) {
-  authoritative_vsync_interval_ = interval;
-  last_interval_ = interval;
-  NotifyObservers(last_timebase_, last_interval_);
-}
-
-void CompositorVSyncManager::UpdateVSyncParameters(base::TimeTicks timebase,
-                                                   base::TimeDelta interval) {
-  if (authoritative_vsync_interval_ != base::TimeDelta::FromSeconds(0))
-    interval = authoritative_vsync_interval_;
-  last_timebase_ = timebase;
-  last_interval_ = interval;
-  NotifyObservers(timebase, interval);
-}
-
-void CompositorVSyncManager::AddObserver(Observer* observer) {
-  observer_list_.AddObserver(observer);
-  observer->OnUpdateVSyncParameters(last_timebase_, last_interval_);
-}
-
-void CompositorVSyncManager::RemoveObserver(Observer* observer) {
-  observer_list_.RemoveObserver(observer);
-}
-
-void CompositorVSyncManager::NotifyObservers(base::TimeTicks timebase,
-                                             base::TimeDelta interval) {
-  FOR_EACH_OBSERVER(CompositorVSyncManager::Observer, observer_list_,
-                    OnUpdateVSyncParameters(timebase, interval));
-}
-
-}  // namespace ui