Should use startAnimation in acceleratorController in order for the animator...

Should use startAnimation in acceleratorController in order for the animator to use the preemption strategy in starting the new animation.

scheduleAnimation will queue up animations. Holding down
Ctrl-Home will after a while keep on rotating well after the accelerator key has been released

Review URL: http://codereview.chromium.org/8741016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112246 0039d316-1c4b-4281-b951-d872f2087c98

ui/aura_shell/shell_accelerator_controller.cc

@@ -64,7 +64,7 @@ void RotateScreen() {
   scoped_ptr<ui::LayerAnimationSequence> screen_rotation(
       new ui::LayerAnimationSequence(new ui::ScreenRotation(delta)));
   screen_rotation->AddObserver(aura::Desktop::GetInstance());
-  aura::Desktop::GetInstance()->layer()->GetAnimator()->ScheduleAnimation(
+  aura::Desktop::GetInstance()->layer()->GetAnimator()->StartAnimation(
       screen_rotation.release());
 }
 #endif