chromeos: Notify power manager about user activity.

ash/wm/user_activity_detector.cc

Index: ash/wm/user_activity_detector.cc
diff --git a/ash/wm/user_activity_detector.cc b/ash/wm/user_activity_detector.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cff36296e1e5e876d98dfd57fee0c155933c1402
--- /dev/null
+++ b/ash/wm/user_activity_detector.cc
@@ -0,0 +1,59 @@
+// 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 "ash/wm/user_activity_detector.h"
+
+namespace ash {
+
+const double UserActivityDetector::kNotifyIntervalSec = 1.0;
+
+UserActivityDetector::UserActivityDetector() {
+}
+
+UserActivityDetector::~UserActivityDetector() {
+}
+
+void UserActivityDetector::AddObserver(UserActivityObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void UserActivityDetector::RemoveObserver(UserActivityObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+bool UserActivityDetector::PreHandleKeyEvent(
+    aura::Window* target, aura::KeyEvent* event) {
+  MaybeNotify();
+  return false;
+}
+
+bool UserActivityDetector::PreHandleMouseEvent(
+    aura::Window* target, aura::MouseEvent* event) {
+  MaybeNotify();
+  return false;
+}
+
+ui::TouchStatus UserActivityDetector::PreHandleTouchEvent(
+    aura::Window* target, aura::TouchEvent* event) {
+  MaybeNotify();
+  return ui::TOUCH_STATUS_UNKNOWN;
+}
+
+ui::GestureStatus UserActivityDetector::PreHandleGestureEvent(
+    aura::Window* target, aura::GestureEvent* event) {
+  MaybeNotify();
+  return ui::GESTURE_STATUS_UNKNOWN;
+}
+
+void UserActivityDetector::MaybeNotify() {
+  base::TimeTicks now = base::TimeTicks::Now();
+  if (last_observer_notification_time_.is_null() ||
+      (now - last_observer_notification_time_).InSecondsF() >=
+      kNotifyIntervalSec) {
+    FOR_EACH_OBSERVER(UserActivityObserver, observers_, OnUserActivity());
+    last_observer_notification_time_ = now;
+  }
+}
+
+}  // namespace ash