Execute CheckTimeLimit when clock is updated

Bug: 899980
Change-Id: I4916f6e284a1fd0a99fff2c9d60535a389fb4655
Reviewed-on: https://chromium-review.googlesource.com/c/1329082Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Henrique Grandinetti <hgrandinetti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606933}

chrome/browser/chromeos/child_accounts/screen_time_controller.cc

@@ -47,6 +47,7 @@ ScreenTimeController::ScreenTimeController(content::BrowserContext* context)
       time_limit_notifier_(context) {
   session_manager::SessionManager::Get()->AddObserver(this);
   system::TimezoneSettings::GetInstance()->AddObserver(this);
+  chromeos::DBusThreadManager::Get()->GetSystemClockClient()->AddObserver(this);
   pref_change_registrar_.Init(pref_service_);
   pref_change_registrar_.Add(
       prefs::kUsageTimeLimit,
@@ -57,6 +58,8 @@ ScreenTimeController::ScreenTimeController(content::BrowserContext* context)
 ScreenTimeController::~ScreenTimeController() {
   session_manager::SessionManager::Get()->RemoveObserver(this);
   system::TimezoneSettings::GetInstance()->RemoveObserver(this);
+  chromeos::DBusThreadManager::Get()->GetSystemClockClient()->RemoveObserver(
+      this);
 }
 
 base::TimeDelta ScreenTimeController::GetScreenTimeDuration() {
@@ -314,4 +317,8 @@ void ScreenTimeController::TimezoneChanged(const icu::TimeZone& timezone) {
   CheckTimeLimit("TimezoneChanged");
 }
 
+void ScreenTimeController::SystemClockUpdated() {
+  CheckTimeLimit("SystemClockUpdated");
+}
+
 }  // namespace chromeos

chrome/browser/chromeos/child_accounts/screen_time_controller.h

@@ -9,6 +9,7 @@
 #include "base/timer/timer.h"
 #include "chrome/browser/chromeos/child_accounts/time_limit_notifier.h"
 #include "chrome/browser/chromeos/child_accounts/usage_time_limit_processor.h"
+#include "chromeos/dbus/system_clock_client.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "components/session_manager/core/session_manager_observer.h"
@@ -28,7 +29,8 @@ namespace chromeos {
 // Schedule notifications and lock/unlock screen based on the processor output.
 class ScreenTimeController : public KeyedService,
                              public session_manager::SessionManagerObserver,
-                             public system::TimezoneSettings::Observer {
+                             public system::TimezoneSettings::Observer,
+                             public chromeos::SystemClockClient::Observer {
  public:
   // Registers preferences.
   static void RegisterProfilePrefs(PrefRegistrySimple* registry);
@@ -78,6 +80,9 @@ class ScreenTimeController : public KeyedService,
   // system::TimezoneSettings::Observer:
   void TimezoneChanged(const icu::TimeZone& timezone) override;
 
+  // chromeos::SystemClockClient::Observer:
+  void SystemClockUpdated() override;
+
   content::BrowserContext* context_;
   PrefService* pref_service_;