Merge changes I25effa3e,Ibb58d1aa,I92454a1b,I878d20a8,I21037b40, ...
* changes:
Enforcing padding on the bottom of the keyguard
Fixes that notifications were sometimes clipped on the lockscreen
Don't reset the velocity when flinging down just because of falsing
Don't do icon animations if we are scrolling fast
Don't translate the notification content while scrolling
Fixed the scrim drawing in seascape
Placed the overflow indicator perfectly in the collapsed center
Improved the low priority behavior with the shelf
Improved the performance of the notification shelf
Fixed a bug where heads up notifications had no icon
Added possibility to use canned animation for icons