cros: Use SessionController for lock starting code

ash/session/session_controller.cc

Index: ash/session/session_controller.cc
diff --git a/ash/session/session_controller.cc b/ash/session/session_controller.cc
index b546c92beb460d343e225adc25238ff112ea1449..ab638809c52164a78b6f2a72aa87a46c4ca7ec85 100644
--- a/ash/session/session_controller.cc
+++ b/ash/session/session_controller.cc
@@ -210,13 +210,20 @@ void SessionController::SetUserSessionOrder(
   }
 }
 
+void SessionController::RunLockAnimation(
+    const RunLockAnimationCallback& callback) {
+  LockStateController* const lock_state_controller =
+      Shell::Get()->lock_state_controller();
+
+  lock_state_controller->SetLockScreenDisplayedCallback(callback);
+  lock_state_controller->OnStartingLock();
+}
+
 void SessionController::RunUnlockAnimation(
     const RunUnlockAnimationCallback& callback) {
   is_unlocking_ = true;
 
-  // Shell could have no instance in tests.

[James Cook, 2017/04/19 23:13:12]

Thanks for cleaning this up.

[xiyuan, 2017/04/20 18:23:59]

I have to put it back. SessionControllerTest derives directly from testing::Test
and has no Shell. :(

-  if (Shell::HasInstance())
-    Shell::Get()->lock_state_controller()->OnLockScreenHide(callback);
+  Shell::Get()->lock_state_controller()->OnLockScreenHide(callback);
 }
 
 void SessionController::NotifyChromeTerminating() {