diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/base/system_monitor.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/base/system_monitor.cc	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,89 @@
+// Copyright (c) 2008 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/system_monitor.h"
+#include "base/logging.h"
+#include "base/message_loop.h"
+
+namespace base {
+
+#if defined(ENABLE_BATTERY_MONITORING)
+// The amount of time (in ms) to wait before running the initial
+// battery check.
+static int kDelayedBatteryCheckMs = 10 * 1000;
+#endif  // defined(ENABLE_BATTERY_MONITORING)
+
+SystemMonitor::SystemMonitor()
+    : battery_in_use_(false),
+      suspended_(false) {
+  observer_list_ = new ObserverListThreadSafe<PowerObserver>();
+}
+
+void SystemMonitor::ProcessPowerMessage(PowerEvent event_id) {
+  // Suppress duplicate notifications.  Some platforms may
+  // send multiple notifications of the same event.
+  switch (event_id) {
+    case POWER_STATE_EVENT:
+      {
+        bool on_battery = IsBatteryPower();
+        if (on_battery != battery_in_use_) {
+          battery_in_use_ = on_battery;
+          NotifyPowerStateChange();
+        }
+      }
+      break;
+    case RESUME_EVENT:
+      if (suspended_) {
+        suspended_ = false;
+        NotifyResume();
+      }
+      break;
+    case SUSPEND_EVENT:
+      if (!suspended_) {
+        suspended_ = true;
+        NotifySuspend();
+      }
+      break;
+  }
+}
+
+void SystemMonitor::AddObserver(PowerObserver* obs) {
+  observer_list_->AddObserver(obs);
+}
+
+void SystemMonitor::RemoveObserver(PowerObserver* obs) {
+  observer_list_->RemoveObserver(obs);
+}
+
+void SystemMonitor::NotifyPowerStateChange() {
+  CHROMIUM_LOG(INFO) << "PowerStateChange: "
+                     << (BatteryPower() ? "On" : "Off") << " battery";
+  observer_list_->Notify(&PowerObserver::OnPowerStateChange, this);
+}
+
+void SystemMonitor::NotifySuspend() {
+  CHROMIUM_LOG(INFO) << "Power Suspending";
+  observer_list_->Notify(&PowerObserver::OnSuspend, this);
+}
+
+void SystemMonitor::NotifyResume() {
+  CHROMIUM_LOG(INFO) << "Power Resuming";
+  observer_list_->Notify(&PowerObserver::OnResume, this);
+}
+
+void SystemMonitor::Start() {
+#if defined(ENABLE_BATTERY_MONITORING)
+  DCHECK(MessageLoop::current());  // Can't call start too early.
+  SystemMonitor* monitor = Get();
+  monitor->delayed_battery_check_.Start(
+      TimeDelta::FromMilliseconds(kDelayedBatteryCheckMs), monitor,
+      &SystemMonitor::BatteryCheck);
+#endif  // defined(ENABLE_BATTERY_MONITORING)
+}
+
+void SystemMonitor::BatteryCheck() {
+  ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
+}
+
+} // namespace base