Destroy scrolling cache for more speed

Change-Id: I6c3f123be8029012bb7f423a25c10cc781ec519b
OTS : Add help text to help the user reset a prefernce

Change-Id: I641bdb1fa5aea3e5c34c0be9610897035b41b235
Merge changes I641bdb1f,I6c3f123b into android-4.4

* changes:
  OTS : Add help text to help the user reset a prefernce
  Destroy scrolling cache for more speed