Fixes issue where notification jumps when user is dragging and its updated

Also fixes an issue where onTouchEvent wasn't being called plumbed through
for the down event.

Test: manual - have a notification, get an update to it while dragging
Change-Id: I681d4333a60616a7b4b1800fb01504c792e343fc
Fixes: 63094338
(cherry picked from commit 89e15ec9)