Created multi-process-friendly PowerMonitor interface.

content/common/power_monitor_client.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/common/power_monitor_client.h"
+
+namespace content {
+
+static PowerMonitorClient* g_power_monitor_client = NULL;

[Ken Russell (switch to Gerrit), 2013/06/24 22:54:38]

This and PowerMonitorClient::Get() should use base::LazyInstance.

+
+PowerMonitorClient::PowerMonitorClient()
+    : observers_(new ObserverListThreadSafe<base::PowerObserver>()),
+      battery_in_use_(false) {
+  DCHECK(!g_power_monitor_client);
+  g_power_monitor_client = this;
+}
+
+PowerMonitorClient::~PowerMonitorClient() {
+  DCHECK_EQ(this, g_power_monitor_client);
+  g_power_monitor_client = NULL;
+}
+
+// static
+PowerMonitorClient* PowerMonitorClient::Get() {
+  return g_power_monitor_client;
+}
+
+void PowerMonitorClient::AddObserver(base::PowerObserver* obs) {
+  observers_->AddObserver(obs);
+}
+
+void PowerMonitorClient::RemoveObserver(base::PowerObserver* obs) {
+  observers_->RemoveObserver(obs);
+}
+
+void PowerMonitorClient::NotifyPowerStateChange(bool battery_in_use) {
+  battery_in_use_ = battery_in_use;
+  observers_->Notify(&base::PowerObserver::OnPowerStateChange, battery_in_use);
+}
+
+void PowerMonitorClient::NotifySuspend() {
+  observers_->Notify(&base::PowerObserver::OnSuspend);
+}
+
+void PowerMonitorClient::NotifyResume() {
+  observers_->Notify(&base::PowerObserver::OnResume);
+}
+
+}  // namespace content