chromeos: Notify power manager about user activity.

chrome/browser/chromeos/power/user_activity_notifier.cc

+// Copyright (c) 2012 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 "chrome/browser/chromeos/power/user_activity_notifier.h"
+
+#include "ash/shell.h"
+#include "ash/wm/user_activity_detector.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/power_manager_client.h"
+
+namespace {
+
+// Minimum number of seconds between notifications.
+const int kNotifyIntervalSec = 5;
+
+}  // namespace
+
+namespace chromeos {
+
+UserActivityNotifier::UserActivityNotifier() {
+  ash::Shell::GetInstance()->user_activity_detector()->AddObserver(this);
+}
+
+UserActivityNotifier::~UserActivityNotifier() {
+  ash::Shell::GetInstance()->user_activity_detector()->RemoveObserver(this);
+}
+
+void UserActivityNotifier::OnUserActivity() {
+  base::TimeTicks now = base::TimeTicks::Now();
+  // InSeconds() truncates rather than rounding, so it's fine for this
+  // comparison.
+  if (last_notify_time_.is_null() ||
+      (now - last_notify_time_).InSeconds() >= kNotifyIntervalSec) {
+    DBusThreadManager::Get()->GetPowerManagerClient()->NotifyUserActivity(now);
+    last_notify_time_ = now;
+  }
+}
+
+}  // namespace chromeos