Unified BeginFrame scheduling

ui/base/compositor/begin_frame_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/base/compositor/begin_frame_manager.h"
+
+namespace ui {
+
+BeginFrameManager::BeginFrameManager() : delegate_(NULL) {
+}
+
+BeginFrameManager::~BeginFrameManager() {
+}
+
+void BeginFrameManager::SendBeginFrame(base::TimeTicks timebase,
+                                       base::TimeDelta interval) {
+  DCHECK(CalledOnValidThread());
+  FOR_EACH_OBSERVER(Observer,
+                    observer_list_,
+                    OnSendBeginFrame(timebase, interval));
+}
+
+void BeginFrameManager::RequestBeginFrame() const {
+  DCHECK(CalledOnValidThread());
+  DCHECK(delegate_);
+  delegate_->RequestBeginFrame();
+}
+
+void BeginFrameManager::AddObserver(Observer* observer) {
+  DCHECK(CalledOnValidThread());
+  observer_list_.AddObserver(observer);
+}
+
+void BeginFrameManager::RemoveObserver(Observer* observer) {
+  DCHECK(CalledOnValidThread());
+  observer_list_.RemoveObserver(observer);
+}
+
+}  // namespace ui