Fix bug 2516434
Fix bug 2516434

AbsListView shouldn't update mLastTouchMode in onTouchModeChanged;
it's only used in onWindowFocusChanged and since onTouchModeChanged
gets called first, the current and last modes will never be different
to trigger the right code path.

Change-Id: Ic9bc454c87826622df54417801fd8f13213c480e

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base