Fire notifications when reboot is requested, not scheduled

chrome/browser/chromeos/system/automatic_reboot_manager_unittest.cc

 // Copyright (c) 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 "chrome/browser/chromeos/system/automatic_reboot_manager.h"
 
 #include <string>
 #include <utility>
 
 #include "ash/shell.h"
@@ skipping 11 matching lines @@
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/time/tick_clock.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/login/users/mock_user_manager.h"
 #include "chrome/browser/chromeos/login/users/scoped_user_manager_enabler.h"
+#include "chrome/browser/chromeos/system/automatic_reboot_manager_observer.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "chromeos/chromeos_paths.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/fake_power_manager_client.h"
 #include "chromeos/dbus/fake_update_engine_client.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/message_center/message_center.h"
 
+using ::testing::_;
+using ::testing::Mock;
 using ::testing::ReturnPointee;
 
 namespace chromeos {
 namespace system {
 
 namespace {
 
 // A SingleThreadTaskRunner that mocks the current time and allows it to be
 // fast-forwarded. The current time in ticks is returned by Now(). The
 // corresponding device uptime is written to |uptime_file_|, providing a mock
@@ skipping 51 matching lines @@
 
   // base::TickClock:
   virtual base::TimeTicks NowTicks() override;
 
  private:
   scoped_refptr<MockTimeSingleThreadTaskRunner> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(MockTimeTickClock);
 };
 
+class MockAutomaticRebootManagerObserver
+    : public AutomaticRebootManagerObserver {
+ public:
+  MockAutomaticRebootManagerObserver();
+  ~MockAutomaticRebootManagerObserver() override;
+
+  // AutomaticRebootManagerObserver:
+  MOCK_METHOD1(OnRebootRequested, void(Reason));
+  MOCK_METHOD0(WillDestroyAutomaticRebootManager, void());
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockAutomaticRebootManagerObserver);
+};
+
 }  // namespace
 
 class AutomaticRebootManagerBasicTest : public testing::Test {
  protected:
   typedef base::OneShotTimer<AutomaticRebootManager> Timer;
 
   AutomaticRebootManagerBasicTest();
   virtual ~AutomaticRebootManagerBasicTest();
 
   // testing::Test:
   virtual void SetUp() override;
   virtual void TearDown() override;
 
   void SetUpdateRebootNeededUptime(const base::TimeDelta& uptime);
   void SetRebootAfterUpdate(bool reboot_after_update, bool expect_reboot);
   void SetUptimeLimit(const base::TimeDelta& limit, bool expect_reboot);
   void NotifyUpdateRebootNeeded();
   void NotifyResumed(bool expect_reboot);
   void NotifyTerminating(bool expect_reboot);
 
   void FastForwardBy(const base::TimeDelta& delta, bool expect_reboot);
   void FastForwardUntilNoTasksRemain(bool expect_reboot);
 
+  void ExpectRebootRequest(AutomaticRebootManagerObserver::Reason reason);
+  void ExpectNoRebootRequest();
+
   void CreateAutomaticRebootManager(bool expect_reboot);
 
   bool ReadUpdateRebootNeededUptimeFromFile(base::TimeDelta* uptime);
+  void VerifyRebootRequested(AutomaticRebootManagerObserver::Reason reason);
+  void VerifyNoRebootRequested() const;
   void VerifyLoginScreenIdleTimerIsStopped() const;
   void VerifyNoGracePeriod() const;
   void VerifyGracePeriod(const base::TimeDelta& start_uptime) const;
 
   bool is_user_logged_in_;
   bool is_logged_in_as_kiosk_app_;
 
   // The uptime is read in the blocking thread pool and then processed on the
   // UI thread. This causes the UI thread to start processing the uptime when it
   // has increased by a small offset already. The offset is calculated and
   // stored in |uptime_processing_delay_| so that tests can accurately determine
   // the uptime seen by the UI thread.
   base::TimeDelta uptime_processing_delay_;
   base::TimeDelta update_reboot_needed_uptime_;
   base::TimeDelta uptime_limit_;
 
   scoped_refptr<MockTimeSingleThreadTaskRunner> task_runner_;
 
+  MockAutomaticRebootManagerObserver automatic_reboot_manager_observer_;
   scoped_ptr<AutomaticRebootManager> automatic_reboot_manager_;
 
  protected:
   FakePowerManagerClient* power_manager_client_;  // Not owned.
   FakeUpdateEngineClient* update_engine_client_;  // Not owned.
 
   // Sets the status of |update_engine_client_| to NEED_REBOOT for tests.
   void SetUpdateStatusNeedReboot();
 
  private:
@@ skipping 146 matching lines @@
     : task_runner_(task_runner) {
 }
 
 MockTimeTickClock::~MockTimeTickClock() {
 }
 
 base::TimeTicks MockTimeTickClock::NowTicks() {
   return task_runner_->Now();
 }
 
+MockAutomaticRebootManagerObserver::MockAutomaticRebootManagerObserver() {
+}
+
+MockAutomaticRebootManagerObserver::~MockAutomaticRebootManagerObserver() {
+}
+
 AutomaticRebootManagerBasicTest::AutomaticRebootManagerBasicTest()
     : is_user_logged_in_(false),
       is_logged_in_as_kiosk_app_(false),
       task_runner_(new MockTimeSingleThreadTaskRunner),
       power_manager_client_(NULL),
       update_engine_client_(NULL),
       reboot_after_update_(false),
       ui_thread_task_runner_handle_(task_runner_),
       mock_user_manager_(new MockUserManager),
       user_manager_enabler_(mock_user_manager_) {
@@ skipping 27 matching lines @@
   dbus_setter->SetUpdateEngineClient(
       scoped_ptr<UpdateEngineClient>(update_engine_client_));
 
   EXPECT_CALL(*mock_user_manager_, IsUserLoggedIn())
      .WillRepeatedly(ReturnPointee(&is_user_logged_in_));
   EXPECT_CALL(*mock_user_manager_, IsLoggedInAsKioskApp())
      .WillRepeatedly(ReturnPointee(&is_logged_in_as_kiosk_app_));
 }
 
 void AutomaticRebootManagerBasicTest::TearDown() {
-  // Let the AutomaticRebootManager, if any, unregister itself as an observer of
-  // several subsystems.
-  automatic_reboot_manager_.reset();
-  task_runner_->RunUntilIdle();
+  if (automatic_reboot_manager_) {
+    Mock::VerifyAndClearExpectations(&automatic_reboot_manager_observer_);
+    EXPECT_CALL(automatic_reboot_manager_observer_,
+                WillDestroyAutomaticRebootManager()).Times(1);
+    EXPECT_CALL(automatic_reboot_manager_observer_,
+                OnRebootRequested(_)).Times(0);
+    // Let the AutomaticRebootManager, if any, unregister itself as an observer
+    // of several subsystems.
+    automatic_reboot_manager_.reset();
+    task_runner_->RunUntilIdle();
+  }
 
   DBusThreadManager::Shutdown();
   TestingBrowserProcess::GetGlobal()->SetLocalState(NULL);
 }
 
 void AutomaticRebootManagerBasicTest::SetUpdateRebootNeededUptime(
     const base::TimeDelta& uptime) {
   update_reboot_needed_uptime_ = uptime;
   SaveUptimeToFile(update_reboot_needed_uptime_file_, uptime);
 }
 
-
 void AutomaticRebootManagerBasicTest::SetRebootAfterUpdate(
     bool reboot_after_update,
     bool expect_reboot) {
   reboot_after_update_ = reboot_after_update;
   local_state_.SetManagedPref(prefs::kRebootAfterUpdate,
                               new base::FundamentalValue(reboot_after_update));
   task_runner_->RunUntilIdle();
   EXPECT_EQ(expect_reboot ? 1 : 0,
             power_manager_client_->num_request_restart_calls());
 }
@@ skipping 47 matching lines @@
             power_manager_client_->num_request_restart_calls());
 }
 
 void AutomaticRebootManagerBasicTest::FastForwardUntilNoTasksRemain(
     bool expect_reboot) {
   task_runner_->FastForwardUntilNoTasksRemain();
   EXPECT_EQ(expect_reboot ? 1 : 0,
             power_manager_client_->num_request_restart_calls());
 }
 
+void AutomaticRebootManagerBasicTest::ExpectRebootRequest(
+    AutomaticRebootManagerObserver::Reason reason) {
+  Mock::VerifyAndClearExpectations(&automatic_reboot_manager_observer_);
+  EXPECT_CALL(automatic_reboot_manager_observer_,
+              WillDestroyAutomaticRebootManager()).Times(0);
+  EXPECT_CALL(automatic_reboot_manager_observer_,
+              OnRebootRequested(_)).Times(0);
+  EXPECT_CALL(automatic_reboot_manager_observer_,
+              OnRebootRequested(reason)).Times(1);
+}
+
+void AutomaticRebootManagerBasicTest::ExpectNoRebootRequest() {
+  Mock::VerifyAndClearExpectations(&automatic_reboot_manager_observer_);
+  EXPECT_CALL(automatic_reboot_manager_observer_,
+              WillDestroyAutomaticRebootManager()).Times(0);
+  EXPECT_CALL(automatic_reboot_manager_observer_,
+              OnRebootRequested(_)).Times(0);
+}
+
 void AutomaticRebootManagerBasicTest::CreateAutomaticRebootManager(
     bool expect_reboot) {
   automatic_reboot_manager_.reset(new AutomaticRebootManager(
       scoped_ptr<base::TickClock>(new MockTimeTickClock(task_runner_))));
+  automatic_reboot_manager_->AddObserver(&automatic_reboot_manager_observer_);
   task_runner_->RunUntilIdle();
   EXPECT_EQ(expect_reboot ? 1 : 0,
             power_manager_client_->num_request_restart_calls());
 
   uptime_processing_delay_ =
       base::TimeTicks() - automatic_reboot_manager_->boot_time_ -
       task_runner_->Uptime();
   EXPECT_GE(uptime_processing_delay_, base::TimeDelta());
   EXPECT_LE(uptime_processing_delay_, base::TimeDelta::FromSeconds(1));
 
@@ skipping 11 matching lines @@
   }
   double seconds;
   if (!base::StringToDouble(contents.substr(0, contents.find(' ')), &seconds) ||
       seconds < 0.0) {
     return false;
   }
   *uptime = base::TimeDelta::FromMilliseconds(seconds * 1000.0);
   return true;
 }
 
+void AutomaticRebootManagerBasicTest::VerifyRebootRequested(
+    AutomaticRebootManagerObserver::Reason reason) {
+  EXPECT_TRUE(automatic_reboot_manager_->reboot_requested());
+  EXPECT_EQ(reason, automatic_reboot_manager_->reboot_reason());
+}
+
+void AutomaticRebootManagerBasicTest::VerifyNoRebootRequested() const {
+  EXPECT_FALSE(automatic_reboot_manager_->reboot_requested());
+}
+
 void AutomaticRebootManagerBasicTest::
     VerifyLoginScreenIdleTimerIsStopped() const {
   VerifyTimerIsStopped(
       automatic_reboot_manager_->login_screen_idle_timer_.get());
 }
 
 void AutomaticRebootManagerBasicTest::VerifyNoGracePeriod() const {
   EXPECT_FALSE(automatic_reboot_manager_->reboot_requested_);
   VerifyTimerIsStopped(automatic_reboot_manager_->grace_start_timer_.get());
   VerifyTimerIsStopped(automatic_reboot_manager_->grace_end_timer_.get());
@@ skipping 65 matching lines @@
 
 AutomaticRebootManagerTest::~AutomaticRebootManagerTest() {
 }
 
 // Chrome is showing the login screen. The current uptime is 12 hours.
 // Verifies that the idle timer is running. Further verifies that when a kiosk
 // app session begins, the idle timer is stopped.
 TEST_F(AutomaticRebootManagerBasicTest, LoginStopsIdleTimer) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately and the login screen
-  // idle timer is started.
+  // Verify that no reboot is requested, the device does not reboot immediately
+  // and the login screen idle timer is started.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Notify that a kiosk app session has been started.
   is_user_logged_in_ = true;
   is_logged_in_as_kiosk_app_ = true;
   automatic_reboot_manager_->Observe(
       chrome::NOTIFICATION_LOGIN_USER_CHANGED,
       content::Source<AutomaticRebootManagerBasicTest>(this),
       content::NotificationService::NoDetails());
 
   // Verify that the login screen idle timer is stopped.
   VerifyLoginScreenIdleTimerIsStopped();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is showing the login screen. The current uptime is 12 hours.
 // Verifies that the idle timer is running. Further verifies that when a
 // non-kiosk-app session begins, the idle timer is stopped.
 TEST_F(AutomaticRebootManagerBasicTest, NonKioskLoginStopsIdleTimer) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately and the login screen
-  // idle timer is started.
+  // Verify that no reboot is requested, the device does not reboot immediately
+  // and the login screen idle timer is started.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Notify that a non-kiosk-app session has been started.
   is_user_logged_in_ = true;
   automatic_reboot_manager_->Observe(
       chrome::NOTIFICATION_LOGIN_USER_CHANGED,
       content::Source<AutomaticRebootManagerBasicTest>(this),
       content::NotificationService::NoDetails());
 
   // Verify that the login screen idle timer is stopped.
   VerifyLoginScreenIdleTimerIsStopped();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is showing the login screen. The uptime limit is 6 hours. The current
 // uptime is 12 hours.
 // Verifies that user activity prevents the device from rebooting. Further
 // verifies that when user activity ceases, the devices reboots.
 TEST_F(AutomaticRebootManagerBasicTest, UserActivityResetsIdleTimer) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately and the login screen
-  // idle timer is started.
+  // Verify that no reboot is requested, the device does not reboot immediately
+  // and the login screen idle timer is started.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Fast forward the uptime by 25 minutes while simulating user activity every
   // 50 seconds.
   for (int i = 0; i < 30; ++i) {
     // Fast forward uptime by 50 seconds. Verify that the device does not reboot
     // immediately.
     FastForwardBy(base::TimeDelta::FromSeconds(50), false);
 
     // Simulate user activity.
     automatic_reboot_manager_->OnUserActivity(NULL);
   }
 
   // Fast forward the uptime by 60 seconds without simulating user activity.
   // Verify that the device reboots immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(60), true);
 }
 
 // Chrome is running a kiosk app session. The current uptime is 10 days.
 // Verifies that when the device is suspended and then resumes, it does not
 // immediately reboot.
 TEST_F(AutomaticRebootManagerBasicTest, ResumeNoPolicy) {
   is_user_logged_in_ = true;
   is_logged_in_as_kiosk_app_ = true;
   task_runner_->SetUptime(base::TimeDelta::FromDays(10));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Notify that the device has resumed from 1 hour of sleep. Verify that the
-  // device does not reboot immediately.
+  // Notify that the device has resumed from 1 hour of sleep. Verify that no
+  // reboot is requested and the device does not reboot immediately.
   NotifyResumed(false);
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running a non-kiosk-app session. The current uptime is 10 days.
 // Verifies that when the device is suspended and then resumes, it does not
 // immediately reboot.
 TEST_F(AutomaticRebootManagerBasicTest, NonKioskResumeAppNoPolicy) {
   is_user_logged_in_ = true;
   task_runner_->SetUptime(base::TimeDelta::FromDays(10));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Notify that the device has resumed from 1 hour of sleep. Verify that the
-  // device does not reboot immediately.
+  // Notify that the device has resumed from 1 hour of sleep. Verify that no
+  // reboot is requested and the device does not reboot immediately.
   NotifyResumed(false);
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running a kiosk app session. The uptime limit is 24 hours. The
 // current uptime is 12 hours.
 // Verifies that when the device is suspended and then resumes, it does not
 // immediately reboot.
 TEST_F(AutomaticRebootManagerBasicTest, ResumeBeforeGracePeriod) {
   is_user_logged_in_ = true;
   is_logged_in_as_kiosk_app_ = true;
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Notify that the device has resumed from 1 hour of sleep. Verify that the
-  // device does not reboot immediately.
+  // Notify that the device has resumed from 1 hour of sleep. Verify that no
+  // reboot is requested and the device does not reboot immediately.
   NotifyResumed(false);
 
-  // Verify that the device eventually reboots.
+  // Verify a reboot is requested and the device reboots eventually.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   FastForwardUntilNoTasksRemain(true);
 }
 
 // Chrome is running a non-kiosk-app session. The uptime limit is 24 hours. The
 // current uptime is 12 hours.
 // Verifies that when the device is suspended and then resumes, it does not
 // immediately reboot.
 TEST_F(AutomaticRebootManagerBasicTest, NonKioskResumeBeforeGracePeriod) {
   is_user_logged_in_ = true;
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Notify that the device has resumed from 1 hour of sleep. Verify that the
-  // device does not reboot immediately.
+  // Notify that the device has resumed from 1 hour of sleep. Verify that no
+  // reboot is requested and the device does not reboot immediately.
   NotifyResumed(false);
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is requested eventually but the device never reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running a kiosk app session. The uptime limit is 6 hours. The
 // current uptime is 12 hours.
 // Verifies that when the device is suspended and then resumes, it immediately
 // reboots.
 TEST_F(AutomaticRebootManagerBasicTest, ResumeInGracePeriod) {
   is_user_logged_in_ = true;
   is_logged_in_as_kiosk_app_ = true;
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Notify that the device has resumed from 1 hour of sleep. Verify that the
   // device reboots immediately.
   NotifyResumed(true);
 }
 
 // Chrome is running a non-kiosk-app session. The uptime limit is 6 hours. The
 // current uptime is 12 hours.
 // Verifies that when the device is suspended and then resumes, it does not
 // immediately reboot.
 TEST_F(AutomaticRebootManagerBasicTest, NonKioskResumeInGracePeriod) {
   is_user_logged_in_ = true;
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Notify that the device has resumed from 1 hour of sleep. Verify that the
   // device does not reboot immediately.
   NotifyResumed(false);
 
-  // Verify that the device does not reboot eventually.
+  // Verify that the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running a kiosk app session. The uptime limit is 6 hours. The
 // current uptime is 29 hours 30 minutes.
 // Verifies that when the device is suspended and then resumes, it immediately
 // reboots.
 TEST_F(AutomaticRebootManagerBasicTest, ResumeAfterGracePeriod) {
   is_user_logged_in_ = true;
   is_logged_in_as_kiosk_app_ = true;
   task_runner_->SetUptime(base::TimeDelta::FromHours(29) +
                           base::TimeDelta::FromMinutes(30));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Notify that the device has resumed from 1 hour of sleep. Verify that the
   // device reboots immediately.
   NotifyResumed(true);
 }
 
 // Chrome is running a non-kiosk-app session. The uptime limit is 6 hours. The
 // current uptime is 29 hours 30 minutes.
 // Verifies that when the device is suspended and then resumes, it does not
 // immediately reboot.
 TEST_F(AutomaticRebootManagerBasicTest, NonKioskResumeAfterGracePeriod) {
   is_user_logged_in_ = true;
   task_runner_->SetUptime(base::TimeDelta::FromHours(29) +
                           base::TimeDelta::FromMinutes(30));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Notify that the device has resumed from 1 hour of sleep. Verify that the
   // device does not reboot immediately.
   NotifyResumed(false);
 
-  // Verify that the device does not reboot eventually.
+  // Verify that the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running. The current uptime is 10 days.
 // Verifies that when the browser terminates, the device does not immediately
 // reboot.
 TEST_P(AutomaticRebootManagerTest, TerminateNoPolicy) {
   task_runner_->SetUptime(base::TimeDelta::FromDays(10));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Notify that the browser is terminating. Verify that the device does not
-  // reboot immediately.
+  // Notify that the browser is terminating. Verify that no reboot is requested
+  // and the device does not reboot immediately.
   NotifyTerminating(false);
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running. The uptime limit is set to 24 hours. The current uptime is
 // 12 hours.
 // Verifies that when the browser terminates, it does not immediately reboot.
 TEST_P(AutomaticRebootManagerTest, TerminateBeforeGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Notify that the browser is terminating. Verify that the device does not
-  // reboot immediately.
+  // Notify that the browser is terminating. Verify that no reboot is requested
+  // and the device does not reboot immediately.
   NotifyTerminating(false);
 
-  // Verify that unless a non-kiosk-app session is in progress, the device
-  // eventually reboots.
+  // Verify that a reboot is requested eventually and unless a non-kiosk-app
+  // session is in progress, the device eventually reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The uptime limit is set to 6 hours. The current uptime is
 // 12 hours.
 // Verifies that when the browser terminates, the device immediately reboots if
 // a kiosk app session is in progress.
 TEST_P(AutomaticRebootManagerTest, TerminateInGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Notify that the browser is terminating. Verify that the device immediately
   // reboots if a kiosk app session is in progress.
   NotifyTerminating(is_logged_in_as_kiosk_app_);
 
-  // Verify that if a non-kiosk-app session is in progress, the device does not
-  // reboot eventually.
+  // Verify that if a non-kiosk-app session is in progress, the device never
+  // reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The current uptime is 12 hours.
 // Verifies that when the uptime limit is set to 24 hours, no reboot occurs and
 // a grace period is scheduled to begin after 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, BeforeUptimeLimitGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Verify that unless a non-kiosk-app session is in progress, the device
-  // eventually reboots.
+  // Verify that a reboot is requested eventually and unless a non-kiosk-app
+  // session is in progress, the device eventually reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The current uptime is 12 hours.
 // Verifies that when the uptime limit is set to 6 hours, a reboot is requested
 // and a grace period is started that will end after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, InUptimeLimitGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The current uptime is 10 days.
 // Verifies that when the uptime limit is set to 6 hours, the device reboots
 // immediately if no non-kiosk-app-session is in progress because the grace
 // period ended after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, AfterUptimeLimitGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromDays(10));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Set the uptime limit. Verify that unless a non-kiosk-app session is in
-  // progress, the the device immediately reboots.
+  // Set the uptime limit. Verify that a reboot is requested and unless a
+  // non-kiosk-app session is in progress, the the device immediately reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), !is_user_logged_in_ ||
                                                 is_logged_in_as_kiosk_app_);
 
-  // Verify that if a non-kiosk-app session is in progress, the device does not
-  // reboot eventually.
+  // Verify that if a non-kiosk-app session is in progress, the device never
+  // reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The uptime limit is set to 12 hours. The current uptime is
 // 6 hours.
 // Verifies that when the uptime limit is removed, the grace period is removed.
 TEST_P(AutomaticRebootManagerTest, UptimeLimitOffBeforeGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(6));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(12), false);
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Fast forward the uptime by 1 hour. Verify that the device does not reboot
-  // immediately.
+  // Fast forward the uptime by 1 hour. Verify that no reboot is requested and
+  // the device does not reboot immediately.
   FastForwardBy(base::TimeDelta::FromHours(1), false);
 
-  // Remove the uptime limit. Verify that the device does not reboot
-  // immediately.
+  // Remove the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta(), false);
 
   // Verify that the grace period has been removed.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running. The uptime limit is set to 12 hours. The current uptime is
 // 24 hours.
 // Verifies that when the uptime limit is removed, the grace period is removed.
 TEST_P(AutomaticRebootManagerTest, UptimeLimitOffInGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(24));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(12), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Fast forward the uptime by 20 seconds. Verify that the device does not
   // reboot immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(20), false);
 
   // Remove the uptime limit. Verify that the device does not reboot
   // immediately.
   SetUptimeLimit(base::TimeDelta(), false);
 
   // Verify that the grace period has been removed.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running. The uptime limit is set to 12 hours. The current uptime is
 // 6 hours.
 // Verifies that when the uptime limit is extended to 24 hours, the grace period
 // is rescheduled to start further in the future.
 TEST_P(AutomaticRebootManagerTest, ExtendUptimeLimitBeforeGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(6));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(12), false);
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Fast forward the uptime by 20 seconds. Verify that the device does not
-  // reboot immediately.
+  // Fast forward the uptime by 20 seconds. Verify that no reboot is requested
+  // and the device does not reboot immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(20), false);
 
-  // Extend the uptime limit. Verify that the device does not reboot
-  // immediately.
+  // Extend the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
 
   // Verify that the grace period has been rescheduled to start further in the
   // future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Verify that unless a non-kiosk-app session is in progress, the device
-  // eventually reboots.
+  // Verify that a reboot is requested eventually and unless a non-kiosk-app
+  // session is in progress, the device eventually reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The uptime limit is set to 12 hours. The current uptime is
 // 18 hours.
 // Verifies that when the uptime limit is extended to 24 hours, the grace period
 // is rescheduled to start in the future.
 TEST_P(AutomaticRebootManagerTest, ExtendUptimeLimitInGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(18));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(12), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Fast forward the uptime by 20 seconds. Verify that the device does not
   // reboot immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(20), false);
 
   // Extend the uptime limit. Verify that the device does not reboot
   // immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
 
   // Verify that the grace period has been rescheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Verify that unless a non-kiosk-app session is in progress, the device
-  // eventually reboots.
+  // Verify that a reboot is requested again eventually and unless a
+  // non-kiosk-app session is in progress, the device eventually reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The uptime limit is set to 18 hours. The current uptime is
 // 12 hours.
 // Verifies that when the uptime limit is shortened to 6 hours, the grace period
 // is rescheduled to have already started.
 TEST_P(AutomaticRebootManagerTest, ShortenUptimeLimitBeforeToInGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(18), false);
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Fast forward the uptime by 20 seconds. Verify that the device does not
-  // reboot immediately.
+  // Fast forward the uptime by 20 seconds. Verify that no reboot is requested
+  // and the device does not reboot immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(20), false);
 
-  // Shorten the uptime limit. Verify that the device does not reboot
-  // immediately.
+  // Shorten the uptime limit. Verify that a reboot is requested but the device
+  // does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that the grace period has been rescheduled and has started already.
   VerifyGracePeriod(uptime_limit_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The uptime limit is set to 24 hours. The current uptime is
 // 36 hours.
 // Verifies that when the uptime limit is shortened to 18 hours, the grace
 // period is rescheduled to have started earlier.
 TEST_P(AutomaticRebootManagerTest, ShortenUptimeLimitInToInGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(36));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Fast forward the uptime by 20 seconds. Verify that the device does not
   // reboot immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(20), false);
 
-  // Shorten the uptime limit. Verify that the device does not reboot
-  // immediately.
+  // Shorten the uptime limit. Verify that a reboot is requested again but the
+  // device does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(18), false);
 
   // Verify that the grace period has been rescheduled to have started earlier.
   VerifyGracePeriod(uptime_limit_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The uptime limit is set to 24 hours. The current uptime is
 // 36 hours.
 // Verifies that when the uptime limit is shortened to 6 hours, the device
 // reboots immediately if no non-kiosk-app session is in progress because the
 // grace period ended after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, ShortenUptimeLimitInToAfterGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(36));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Fast forward the uptime by 20 seconds. Verify that the device does not
   // reboot immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(20), false);
 
-  // Shorten the uptime limit. Verify that unless a non-kiosk-app session is in
-  // progress, the the device immediately reboots.
+  // Shorten the uptime limit. Verify that a reboot is requested again and
+  // unless a non-kiosk-app session is in progress, the the device immediately
+  // reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), !is_user_logged_in_ ||
                                                 is_logged_in_as_kiosk_app_);
 
-  // Verify that if a non-kiosk-app session is in progress, the device does not
-  // reboot eventually.
+  // Verify that if a non-kiosk-app session is in progress, the device never
+  // reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The current uptime is 12 hours.
 // Verifies that when an update is applied, the current uptime is persisted as
 // the time at which a reboot became necessary. Further verifies that when the
 // policy to automatically reboot after an update is not enabled, no reboot
 // occurs and no grace period is scheduled.
 TEST_P(AutomaticRebootManagerTest, UpdateNoPolicy) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that no reboot is requested and the device does not reboot immediately.
   NotifyUpdateRebootNeeded();
 
   // Verify that the current uptime has been persisted as the time at which a
   // reboot became necessary.
   EXPECT_TRUE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
   EXPECT_EQ(task_runner_->Uptime(), update_reboot_needed_uptime_);
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running. The current uptime is 12 hours.
 // Verifies that when an update is applied, the current uptime is persisted as
 // the time at which a reboot became necessary. Further verifies that when the
 // policy to automatically reboot after an update is enabled, a reboot is
 // requested and a grace period is started that will end 24 hours from now.
 TEST_P(AutomaticRebootManagerTest, Update) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that a reboot is requested but the device does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   NotifyUpdateRebootNeeded();
 
   // Verify that the current uptime has been persisted as the time at which a
   // reboot became necessary.
   EXPECT_TRUE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
   EXPECT_EQ(task_runner_->Uptime(), update_reboot_needed_uptime_);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(update_reboot_needed_uptime_ + uptime_processing_delay_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The current uptime is 12 hours.
 // Verifies that when Chrome is notified twice that an update has been applied,
-// the second notification is ignored and the uptime at which it occured does
+// the second notification is ignored and the uptime at which it occurred does
 // not get persisted as the time at which an update became necessary.
 TEST_P(AutomaticRebootManagerTest, UpdateAfterUpdate) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that a reboot is requested but the device does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   NotifyUpdateRebootNeeded();
 
   // Verify that the current uptime has been persisted as the time at which a
   // reboot became necessary.
   EXPECT_TRUE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
   EXPECT_EQ(task_runner_->Uptime(), update_reboot_needed_uptime_);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(update_reboot_needed_uptime_ + uptime_processing_delay_);
@@ skipping 14 matching lines @@
   EXPECT_EQ(update_reboot_needed_uptime_, new_update_reboot_needed_uptime);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The current uptime is 10 minutes.
 // Verifies that when the policy to automatically reboot after an update is
-// enabled, no reboot occurs a grace period is scheduled to begin after the
+// enabled, no reboot occurs and a grace period is scheduled to begin after the
 // minimum of 1 hour of uptime. Further verifies that when an update is applied,
 // the current uptime is persisted as the time at which a reboot became
 // necessary.
 TEST_P(AutomaticRebootManagerTest, UpdateBeforeMinimumUptime) {
   task_runner_->SetUptime(base::TimeDelta::FromMinutes(10));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that no reboot is requested and the device does not reboot immediately.
   NotifyUpdateRebootNeeded();
 
   // Verify that the current uptime has been persisted as the time at which a
   // reboot became necessary.
   EXPECT_TRUE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
   EXPECT_EQ(task_runner_->Uptime(), update_reboot_needed_uptime_);
 
   // Verify that a grace period has been scheduled to begin in the future.
   VerifyGracePeriod(base::TimeDelta::FromHours(1));
 
-  // Verify that unless a non-kiosk-app session is in progress, the device
-  // eventually reboots.
+  // Verify that a reboot is requested eventually and unless a non-kiosk-app
+  // session is in progress, the device eventually reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. An update was applied and a reboot became necessary to
 // complete the update process after 6 hours of uptime. The current uptime is
 // 12 hours.
 // Verifies that when the policy to automatically reboot after an update is
 // enabled, a reboot is requested and a grace period is started that will end
 // after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, PolicyAfterUpdateInGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(6));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that no reboot is requested and the device does not reboot immediately.
   NotifyUpdateRebootNeeded();
 
-  // Fast forward the uptime to 12 hours. Verify that the device does not reboot
-  // immediately.
+  // Fast forward the uptime to 12 hours. Verify that no reboot is requested and
+  // the device does not reboot immediately.
   FastForwardBy(base::TimeDelta::FromHours(6), false);
 
   // Simulate user activity.
   automatic_reboot_manager_->OnUserActivity(NULL);
 
-  // Enable automatic reboot after an update has been applied. Verify that the
-  // device does not reboot immediately.
+  // Enable automatic reboot after an update has been applied. Verify that a
+  // reboot is requested but the device does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   SetRebootAfterUpdate(true, false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(base::TimeDelta::FromHours(6) + uptime_processing_delay_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. An update was applied and a reboot became necessary to
 // complete the update process after 6 hours of uptime. The current uptime is
 // 10 days.
 // Verifies that when the policy to automatically reboot after an update is
 // enabled, the device reboots immediately if no non-kiosk-app session is in
 // progress because the grace period ended after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, PolicyAfterUpdateAfterGracePeriod) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(6));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that no reboot is requested and the device does not reboot immediately.
   NotifyUpdateRebootNeeded();
 
-  // Fast forward the uptime to 12 hours. Verify that the device does not reboot
-  // immediately.
+  // Fast forward the uptime to 12 hours. Verify that no reboot is requested and
+  // the device does not reboot immediately.
   FastForwardBy(base::TimeDelta::FromDays(10) - base::TimeDelta::FromHours(6),
                 false);
 
   // Simulate user activity.
   automatic_reboot_manager_->OnUserActivity(NULL);
 
   // Enable automatic rebooting after an update has been applied. Verify that
-  // unless a non-kiosk-app session is in progress, the the device immediately
-  // reboots.
+  // a reboot is requested and unless a non-kiosk-app session is in progress,
+  // the the device immediately reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   SetRebootAfterUpdate(true, !is_user_logged_in_ || is_logged_in_as_kiosk_app_);
 
-  // Verify that if a non-kiosk-app session is in progress, the device does not
-  // reboot eventually.
+  // Verify that if a non-kiosk-app session is in progress, the device never
+  // reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. An update was applied and a reboot became necessary to
 // complete the update process after 6 hours of uptime. The policy to
 // automatically reboot after an update is enabled. The current uptime is
 // 6 hours 20 seconds.
 // Verifies that when the policy to automatically reboot after an update is
 // disabled, the reboot request and grace period are removed.
 TEST_P(AutomaticRebootManagerTest, PolicyOffAfterUpdate) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(6));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that a reboot is requested but the device does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   NotifyUpdateRebootNeeded();
 
   // Verify that a grace period has started.
   VerifyGracePeriod(task_runner_->Uptime() + uptime_processing_delay_);
 
   // Fast forward the uptime by 20 seconds. Verify that the device does not
   // reboot immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(20), false);
 
   // Disable automatic rebooting after an update has been applied. Verify that
-  // the device does not reboot immediately.
+  // no reboot is requested and the device does not reboot immediately.
   SetRebootAfterUpdate(false, false);
 
   // Verify that the grace period has been removed.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running. The current uptime is not available.
 // Verifies that even if an uptime limit is set, the policy to automatically
 // reboot after an update is enabled and an update has been applied, no reboot
 // occurs and no grace period is scheduled. Further verifies that no time is
 // persisted as the time at which a reboot became necessary.
 TEST_P(AutomaticRebootManagerTest, NoUptime) {
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
   // Enable automatic rebooting after an update has been applied. Verify that
-  // the device does not reboot immediately.
+  // no reboot is requested and the device does not reboot immediately.
   SetRebootAfterUpdate(true, false);
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that no reboot is requested and the device does not reboot immediately.
   NotifyUpdateRebootNeeded();
 
   // Verify that no time is persisted as the time at which a reboot became
   // necessary.
   EXPECT_FALSE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running. The policy to automatically reboot after an update is
 // enabled. The current uptime is 12 hours.
 // Verifies that when an uptime limit of 6 hours is set, the availability of an
 // update does not cause the grace period to be rescheduled. Further verifies
 // that the current uptime is persisted as the time at which a reboot became
 // necessary.
 TEST_P(AutomaticRebootManagerTest, UptimeLimitBeforeUpdate) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
   // Fast forward the uptime by 20 seconds. Verify that the device does not
   // reboot immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(20), false);
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that a reboot is requested again but the device does not reboot
+  // immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   NotifyUpdateRebootNeeded();
 
   // Verify that the current uptime has been persisted as the time at which a
   // reboot became necessary.
   EXPECT_TRUE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
   EXPECT_EQ(task_runner_->Uptime(), update_reboot_needed_uptime_);
 
   // Verify that the grace period has not been rescheduled.
   VerifyGracePeriod(uptime_limit_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The policy to automatically reboot after an update is
 // enabled. The current uptime is 12 hours.
 // Verifies that when an uptime limit of 24 hours is set, the availability of an
 // update causes the grace period to be rescheduled so that it ends 24 hours
 // from now. Further verifies that the current uptime is persisted as the time
 // at which a reboot became necessary.
 TEST_P(AutomaticRebootManagerTest, UpdateBeforeUptimeLimit) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Fast forward the uptime by 20 seconds. Verify that the device does not
-  // reboot immediately.
+  // Fast forward the uptime by 20 seconds. Verify that no reboot is requested
+  // and the device does not reboot immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(20), false);
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that a reboot is requested but the device does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   NotifyUpdateRebootNeeded();
 
   // Verify that the current uptime has been persisted as the time at which a
   // reboot became necessary.
   EXPECT_TRUE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
   EXPECT_EQ(task_runner_->Uptime(), update_reboot_needed_uptime_);
 
   // Verify that the grace period has been rescheduled to start at the time that
   // the update became available.
   VerifyGracePeriod(update_reboot_needed_uptime_ + uptime_processing_delay_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is running. The uptime limit is set to 24 hours. An update was applied
 // and a reboot became necessary to complete the update process after 12 hours.
 // The policy to automatically reboot after an update is enabled. The current
 // uptime is 12 hours 20 seconds.
 // Verifies that when the policy to reboot after an update is disabled, the
-// grace period is rescheduled to start after 24 hours of uptime. Further
+// grace period is rescheduled to start after 12 hours of uptime. Further
 // verifies that when the uptime limit is removed, the grace period is removed.
 TEST_P(AutomaticRebootManagerTest, PolicyOffThenUptimeLimitOff) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that no reboot is requested and the device
+  // does not reboot immediately.
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
 
-  // Verify that the grace period has started.
+  // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that a reboot is requested but the device does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   NotifyUpdateRebootNeeded();
 
   // Verify that the current uptime has been persisted as the time at which a
   // reboot became necessary.
   EXPECT_TRUE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
   EXPECT_EQ(task_runner_->Uptime(), update_reboot_needed_uptime_);
 
   // Verify that a grace period has been rescheduled to end 24 hours from now.
   VerifyGracePeriod(update_reboot_needed_uptime_ + uptime_processing_delay_);
@@ skipping 10 matching lines @@
   // of uptime.
   VerifyGracePeriod(uptime_limit_);
 
   // Remove the uptime limit. Verify that the device does not reboot
   // immediately.
   SetUptimeLimit(base::TimeDelta(), false);
 
   // Verify that the grace period has been removed.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running. The uptime limit is set to 6 hours. An update was applied
 // and a reboot became necessary to complete the update process after 12 hours.
 // The policy to automatically reboot after an update is enabled. The current
 // uptime is 12 hours 20 seconds.
 // Verifies that when the uptime limit is removed, the grace period is
 // rescheduled to have started after 12 hours of uptime. Further verifies that
 // when the policy to reboot after an update is disabled, the reboot request and
 // grace period are removed.
 TEST_P(AutomaticRebootManagerTest, UptimeLimitOffThenPolicyOff) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Notify that an update has been applied and a reboot is necessary. Verify
-  // that the device does not reboot immediately.
+  // that a reboot is requested but the device does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   NotifyUpdateRebootNeeded();
 
   // Verify that the current uptime has been persisted as the time at which a
   // reboot became necessary.
   EXPECT_TRUE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
   EXPECT_EQ(task_runner_->Uptime(), update_reboot_needed_uptime_);
 
   // Verify that the grace period has started.
   VerifyGracePeriod(update_reboot_needed_uptime_ + uptime_processing_delay_);
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested again but the
+  // device does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that the grace period has been rescheduled to have started after
   // 6 hours of uptime.
   VerifyGracePeriod(uptime_limit_);
 
   // Fast forward the uptime by 20 seconds. Verify that the device does not
   // reboot immediately.
   FastForwardBy(base::TimeDelta::FromSeconds(20), false);
 
-  // Remove the uptime limit. Verify that the device does not reboot
-  // immediately.
+  // Remove the uptime limit. Verify that a reboot is requested again but the
+  // device does not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   SetUptimeLimit(base::TimeDelta(), false);
 
   // Verify that a grace period has been rescheduled to have started after 12
   // hours of uptime.
   VerifyGracePeriod(update_reboot_needed_uptime_ + uptime_processing_delay_);
 
   // Disable automatic reboot after an update has been applied. Verify that the
   // device does not reboot immediately.
   SetRebootAfterUpdate(false, false);
 
   // Verify that the grace period has been removed.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is running. The uptime limit is 6 hours. The current uptime is
 // 29 hours 59 minutes 59 seconds.
 // Verifies that if no non-kiosk-app session is in progress, the device reboots
 // immediately when the grace period ends after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, GracePeriodEnd) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(29) +
                           base::TimeDelta::FromMinutes(59) +
                           base::TimeDelta::FromSeconds(59));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
-  // Set the uptime limit. Verify that the device does not reboot immediately.
+  // Set the uptime limit. Verify that a reboot is requested but the device does
+  // not reboot immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Fast forward the uptime by 1 second. Verify that unless a non-kiosk-app
   // session is in progress, the the device immediately reboots.
   FastForwardBy(base::TimeDelta::FromSeconds(1), !is_user_logged_in_ ||
                                                  is_logged_in_as_kiosk_app_);
 
-  // Verify that if a non-kiosk-app session is in progress, the device does not
-  // reboot eventually.
+  // Verify that if a non-kiosk-app session is in progress, the device never
+  // reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is starting. The current uptime is 10 days.
 // Verifies that when no automatic reboot policy is enabled, no reboot occurs
 // and no grace period is scheduled.
 TEST_P(AutomaticRebootManagerTest, StartNoPolicy) {
   task_runner_->SetUptime(base::TimeDelta::FromDays(10));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is starting. The uptime limit is set to 24 hours. The current uptime
 // is 12 hours.
 // Verifies that no reboot occurs and a grace period is scheduled to begin after
 // 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, StartBeforeUptimeLimitGracePeriod) {
   SetUptimeLimit(base::TimeDelta::FromHours(24), false);
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(uptime_limit_);
 
-  // Verify that unless a non-kiosk-app session is in progress, the device
-  // eventually reboots.
+  // Verify that a reboot is requested eventually and unless a non-kiosk-app
+  // session is in progress, the device eventually reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is starting. The uptime limit is set to 6 hours. The current uptime is
 // 10 days.
 // Verifies that if no non-kiosk-app session is in progress, the device reboots
 // immediately because the grace period ended after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, StartAfterUptimeLimitGracePeriod) {
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
   task_runner_->SetUptime(base::TimeDelta::FromDays(10));
 
-  // Verify that unless a non-kiosk-app session is in progress, the the device
-  // immediately reboots.
+  // Verify that a reboot is requested and unless a non-kiosk-app session is in
+  // progress, the the device immediately reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   CreateAutomaticRebootManager(!is_user_logged_in_ ||
                                is_logged_in_as_kiosk_app_);
+  VerifyRebootRequested(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
 
-  // Verify that if a non-kiosk-app session is in progress, the device does not
-  // reboot eventually.
+  // Verify that if a non-kiosk-app session is in progress, the device never
+  // reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is starting. The uptime limit is set to 6 hours. The current uptime is
 // 12 hours.
 // Verifies that a reboot is requested and a grace period is started that will
 // end after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, StartInUptimeLimitGracePeriod) {
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that a reboot is requested but the device does not reboot
+  // immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   CreateAutomaticRebootManager(false);
+  VerifyRebootRequested(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is starting. An update was applied and a reboot became necessary to
 // complete the update process after 6 hours of uptime. The current uptime is
 // 10 days.
 // Verifies that when the policy to automatically reboot after an update is
 // enabled, the device reboots immediately if no non-kiosk-app session is in
 // progress because the grace period ended after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, StartAfterUpdateGracePeriod) {
   SetUpdateStatusNeedReboot();
   SetUpdateRebootNeededUptime(base::TimeDelta::FromHours(6));
   task_runner_->SetUptime(base::TimeDelta::FromDays(10));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that unless a non-kiosk-app session is in progress, the device
-  // reboots immediately.
+  // Verify that a reboot is requested and unless a non-kiosk-app session is in
+  // progress, the the device immediately reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   CreateAutomaticRebootManager(!is_user_logged_in_ ||
                                is_logged_in_as_kiosk_app_);
+  VerifyRebootRequested(
+      AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
 
-  // Verify that if a non-kiosk-app session is in progress, the device does not
-  // reboot eventually.
+  // Verify that if a non-kiosk-app session is in progress, the device never
+  // reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is starting. An update was applied and a reboot became necessary to
 // complete the update process after 6 hours of uptime. The current uptime is
 // 12 hours.
 // Verifies that when the policy to automatically reboot after an update is
 // enabled, a reboot is requested and a grace period is started that will end
 // after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, StartInUpdateGracePeriod) {
   SetUpdateStatusNeedReboot();
   SetUpdateRebootNeededUptime(base::TimeDelta::FromHours(6));
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that a reboot is requested but the device does not reboot
+  // immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   CreateAutomaticRebootManager(false);
+  VerifyRebootRequested(
+      AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(update_reboot_needed_uptime_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is starting. An update was applied and a reboot became necessary to
 // complete the update process after 10 minutes of uptime. The current uptime is
 // 20 minutes.
 // Verifies that when the policy to automatically reboot after an update is
 // enabled, no reboot occurs and a grace period is scheduled to begin after the
 // minimum of 1 hour of uptime.
 TEST_P(AutomaticRebootManagerTest, StartBeforeUpdateGracePeriod) {
   SetUpdateStatusNeedReboot();
   SetUpdateRebootNeededUptime(base::TimeDelta::FromMinutes(10));
   task_runner_->SetUptime(base::TimeDelta::FromMinutes(20));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that a grace period has been scheduled to start in the future.
   VerifyGracePeriod(base::TimeDelta::FromHours(1));
 
-  // Verify that unless a non-kiosk-app session is in progress, the device
-  // eventually reboots.
+  // Verify that a reboot is requested eventually and unless a non-kiosk-app
+  // session is in progress, the device eventually reboots.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is starting. An update was applied and a reboot became necessary to
 // complete the update process after 6 hours of uptime. The current uptime is
 // 10 days.
 // Verifies that when the policy to automatically reboot after an update is not
 // enabled, no reboot occurs and no grace period is scheduled.
 TEST_P(AutomaticRebootManagerTest, StartUpdateNoPolicy) {
   SetUpdateStatusNeedReboot();
   SetUpdateRebootNeededUptime(base::TimeDelta::FromHours(6));
   task_runner_->SetUptime(base::TimeDelta::FromDays(10));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is starting. An update was applied and a reboot became necessary to
 // complete the update process but the time at which this happened was lost. The
 // current uptime is 10 days.
 // Verifies that the current uptime is persisted as the time at which a reboot
 // became necessary. Further verifies that when the policy to automatically
 // reboot after an update is enabled, a reboot is requested and a grace period
 // is started that will end 24 hours from now.
 TEST_P(AutomaticRebootManagerTest, StartUpdateTimeLost) {
   SetUpdateStatusNeedReboot();
   task_runner_->SetUptime(base::TimeDelta::FromDays(10));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that a reboot is requested but the device does not reboot
+  // immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   CreateAutomaticRebootManager(false);
+  VerifyRebootRequested(
+      AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
 
   // Verify that the current uptime has been persisted as the time at which a
   // reboot became necessary.
   EXPECT_TRUE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
   EXPECT_EQ(task_runner_->Uptime(), update_reboot_needed_uptime_);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(update_reboot_needed_uptime_ + uptime_processing_delay_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is starting. An update was applied and a reboot became necessary to
 // complete the update process but the time at which this happened was lost. The
 // current uptime is 10 days.
 // Verifies that the current uptime is persisted as the time at which a reboot
 // became necessary. Further verifies that when the policy to automatically
 // reboot after an update is not enabled, no reboot occurs and no grace period
 // is scheduled.
 TEST_P(AutomaticRebootManagerTest, StartUpdateNoPolicyTimeLost) {
   SetUpdateStatusNeedReboot();
   task_runner_->SetUptime(base::TimeDelta::FromDays(10));
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that the current uptime has been persisted as the time at which a
   // reboot became necessary.
   EXPECT_TRUE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
   EXPECT_EQ(task_runner_->Uptime(), update_reboot_needed_uptime_);
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is starting. No update has been applied. The current uptime is
 // 12 hours.
 // Verifies that no time is persisted as the time at which a reboot became
 // necessary. Further verifies that no reboot occurs and no grace period is
 // scheduled.
 TEST_P(AutomaticRebootManagerTest, StartNoUpdate) {
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no time is persisted as the time at which a reboot became
   // necessary.
   EXPECT_FALSE(ReadUpdateRebootNeededUptimeFromFile(
       &update_reboot_needed_uptime_));
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 // Chrome is starting. The uptime limit is set to 6 hours. Also, an update was
 // applied and a reboot became necessary to complete the update process after
 // 8 hours of uptime. The current uptime is 12 hours.
 // Verifies that when the policy to automatically reboot after an update is
 // enabled, a reboot is requested and a grace period is started that will end
 // after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, StartUptimeLimitBeforeUpdate) {
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
   SetUpdateStatusNeedReboot();
   SetUpdateRebootNeededUptime(base::TimeDelta::FromHours(8));
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that a reboot is requested but the device does not reboot
+  // immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
   CreateAutomaticRebootManager(false);
+  VerifyRebootRequested(AutomaticRebootManagerObserver::REBOOT_REASON_PERIODIC);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(uptime_limit_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is starting. The uptime limit is set to 8 hours. Also, an update was
 // applied and a reboot became necessary to complete the update process after
 // 6 hours of uptime. The current uptime is 12 hours.
 // Verifies that when the policy to automatically reboot after an update is
 // enabled, a reboot is requested and a grace period is started that will end
 // after 6 + 24 hours of uptime.
 TEST_P(AutomaticRebootManagerTest, StartUpdateBeforeUptimeLimit) {
   SetUptimeLimit(base::TimeDelta::FromHours(8), false);
   SetUpdateStatusNeedReboot();
   SetUpdateRebootNeededUptime(base::TimeDelta::FromHours(6));
   task_runner_->SetUptime(base::TimeDelta::FromHours(12));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that a reboot is requested but the device does not reboot
+  // immediately.
+  ExpectRebootRequest(AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
   CreateAutomaticRebootManager(false);
+  VerifyRebootRequested(
+      AutomaticRebootManagerObserver::REBOOT_REASON_OS_UPDATE);
 
   // Verify that a grace period has started.
   VerifyGracePeriod(update_reboot_needed_uptime_);
 
   // Verify that unless a non-kiosk-app session is in progress, the device
   // eventually reboots.
   FastForwardUntilNoTasksRemain(!is_user_logged_in_ ||
                                 is_logged_in_as_kiosk_app_);
 }
 
 // Chrome is starting. The uptime limit is set to 6 hours. Also, an update was
 // applied and a reboot became necessary to complete the update process after
 // 6 hours of uptime. The current uptime is not available.
 // Verifies that even if the policy to automatically reboot after an update is
 // enabled, no reboot occurs and no grace period is scheduled.
 TEST_P(AutomaticRebootManagerTest, StartNoUptime) {
   SetUptimeLimit(base::TimeDelta::FromHours(6), false);
   SetUpdateStatusNeedReboot();
   SetUpdateRebootNeededUptime(base::TimeDelta::FromHours(6));
   SetRebootAfterUpdate(true, false);
 
-  // Verify that the device does not reboot immediately.
+  // Verify that no reboot is requested and the device does not reboot
+  // immediately.
+  ExpectNoRebootRequest();
   CreateAutomaticRebootManager(false);
+  VerifyNoRebootRequested();
 
   // Verify that no grace period has started.
   VerifyNoGracePeriod();
 
-  // Verify that the device does not reboot eventually.
+  // Verify that a reboot is never requested and the device never reboots.
   FastForwardUntilNoTasksRemain(false);
 }
 
 INSTANTIATE_TEST_CASE_P(
     AutomaticRebootManagerTestInstance,
     AutomaticRebootManagerTest,
     ::testing::Values(
         AUTOMATIC_REBOOT_MANAGER_TEST_SCENARIO_LOGIN_SCREEN,
         AUTOMATIC_REBOOT_MANAGER_TEST_SCENARIO_KIOSK_APP_SESSION,
         AUTOMATIC_REBOOT_MANAGER_TEST_SCENARIO_NON_KIOSK_APP_SESSION));
 
 }  // namespace system
 }  // namespace chromeos