Created multi-process-friendly PowerMonitor interface.

content/common/power_monitor_message_broadcaster.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_message_broadcaster.h"
+
+#include "base/power_monitor/power_monitor.h"
+#include "content/common/power_monitor_messages.h"
+#include "ipc/ipc_sender.h"
+
+namespace content {
+
+PowerMonitorMessageBroadcaster::PowerMonitorMessageBroadcaster(
+    IPC::Sender* sender) : sender_(sender) {
+  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
+  if (power_monitor)

[vandebo (ex-Chrome), 2013/07/02 22:53:12]

Is there a specific case where this is not true?  Start up should be
deterministic/easy to validate.  Probably just want to DCHECK(power_monitor) ?

+    power_monitor->AddObserver(this);
+}
+
+PowerMonitorMessageBroadcaster::~PowerMonitorMessageBroadcaster() {
+  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
+  if (power_monitor)
+    power_monitor->RemoveObserver(this);
+}
+
+void PowerMonitorMessageBroadcaster::OnPowerStateChange(bool on_battery_power) {
+  sender_->Send(new PowerMonitorMsg_PowerStateChange(on_battery_power));
+}
+
+void PowerMonitorMessageBroadcaster::OnSuspend() {
+  sender_->Send(new PowerMonitorMsg_Suspend());
+}
+
+void PowerMonitorMessageBroadcaster::OnResume() {
+  sender_->Send(new PowerMonitorMsg_Resume());
+}
+
+}  // namespace content