Speed up Statusbar - Idea from http://goo.gl/3ASfz

Change-Id: I4c175eb7c139c632b7aa81b29ebdd2251069fac3
Speed up notification pulldown

Change-Id: Iec32a75d8c9c61e59130af54d319fb0a1c0ba00b
Fix a programmatic smooth scroll bug

Bug: smoothScrollToPosition() stops at child view of which height is
higher than list view itself.

Change-Id: I695ca9db4c706aa7f365967dd3916f9a01917346
Signed-off-by: Yongyi Li <yongyi.li.cn@gmail.com>
Merge changes I695ca9db,Iec32a75d,I4c175eb7 into du44

* changes:
  Fix a programmatic smooth scroll bug
  Speed up notification pulldown
  Speed up Statusbar - Idea from http://goo.gl/3ASfz