Add xidle library to power_manager for testing how long the user has been idle

src/platform/power_manager/xidle_unittest.cc

+// Copyright (c) 2009-2010 The Chromium OS 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 <gtest/gtest.h>
+#include <unistd.h>
+
+#include <base/command_line.h>
+#include <base/logging.h>
+
+#include "power_manager/xidle.h"
+
+namespace chromeos {
+
+class XIdleTest : public ::testing::Test { };
+
+TEST(XIdleTest, GetIdleTimeTest) {
+  uint64 idleTime = kuint64max;
+  chromeos::XIdle idle;
+  if (idle.getIdleTime(&idleTime))
+    ASSERT_NE(idleTime, kuint64max);
+  else
+    ASSERT_EQ(idleTime, kuint64max);
+}
+
+}  // namespace login_manager