Call session_manager's EmitArcBooted() D-Bus method when ARC is ready

components/arc/boot_phase_monitor/arc_boot_phase_monitor_bridge.cc

Index: components/arc/boot_phase_monitor/arc_boot_phase_monitor_bridge.cc
diff --git a/components/arc/boot_phase_monitor/arc_boot_phase_monitor_bridge.cc b/components/arc/boot_phase_monitor/arc_boot_phase_monitor_bridge.cc
index fbbe8c24a40d2b118780238b225e317e3d3c6138..8b4416d3d1f9cdad918f26c3a2042641aaedd609 100644
--- a/components/arc/boot_phase_monitor/arc_boot_phase_monitor_bridge.cc
+++ b/components/arc/boot_phase_monitor/arc_boot_phase_monitor_bridge.cc
@@ -49,6 +49,7 @@ void ArcBootPhaseMonitorBridge::OnBootCompleted() {
       chromeos::DBusThreadManager::Get()->GetSessionManagerClient();
   session_manager_client->PrioritizeArcInstance(
       base::Bind(PrioritizeArcInstanceCallback));
+  session_manager_client->EmitArcBooted();
 }
 
 }  // namespace arc