Added quick lock mechanism while in Touchview

ash/wm/lock_state_controller.h

Index: ash/wm/lock_state_controller.h
diff --git a/ash/wm/lock_state_controller.h b/ash/wm/lock_state_controller.h
index b6d134f9e7d9147e139c5ec21cbb425f716016a9..505b90772119575a61bd2dc6c1db7452f2aae16e 100644
--- a/ash/wm/lock_state_controller.h
+++ b/ash/wm/lock_state_controller.h
@@ -161,8 +161,10 @@ class ASH_EXPORT LockStateController : public aura::WindowTreeHostObserver,
   void StartShutdownAnimation();
 
   // Starts usual lock animation, but locks immediately.
-  // Unlike StartLockAnimation it does no lead to StartShutdownAnimation.
-  void StartLockAnimationAndLockImmediately();
+  // After locking and |kLockToShutdownTimeoutMs| StartShutdownAnimation()
+  // will be called unless CancelShutdownAnimation() is called, if
+  // |shutdown_after_lock| is true.
+  void StartLockAnimationAndLockImmediately(bool shutdown_after_lock);
 
   // Returns true if we have requested system to lock, but haven't received
   // confirmation yet.