Condition added to prevent lock animation on Supervised User creation.

ash/wm/power_button_controller.cc

Index: ash/wm/power_button_controller.cc
diff --git a/ash/wm/power_button_controller.cc b/ash/wm/power_button_controller.cc
index 5a26a83cbf113911fd4fb23d6733e46ff880835d..d3866685b17c4370a01327cf5ba243afdfe3efc4 100644
--- a/ash/wm/power_button_controller.cc
+++ b/ash/wm/power_button_controller.cc
@@ -78,7 +78,7 @@ void PowerButtonController::OnPowerButtonEvent(
     // immediately.
     if (down) {
       if (session_state_delegate->CanLockScreen() &&
-          !session_state_delegate->IsScreenLocked() &&
+          !session_state_delegate->IsUserSessionBlocked() &&
           !controller_->LockRequested()) {
         controller_->StartLockAnimationAndLockImmediately(false);
       } else {
@@ -92,7 +92,7 @@ void PowerButtonController::OnPowerButtonEvent(
         return;
 
       if (session_state_delegate->CanLockScreen() &&
-          !session_state_delegate->IsScreenLocked()) {
+          !session_state_delegate->IsUserSessionBlocked()) {
         if (Shell::GetInstance()->maximize_mode_controller()->
             IsMaximizeModeWindowManagerEnabled() && enable_quick_lock_)
           controller_->StartLockAnimationAndLockImmediately(true);