Remove unnecessary allocations

This change removes a couple of allocations per frame when the user
is trying to scroll past the end of the workspace. The allocated
object, PorterDuffXfermode, is pretty expensive and creating a new
one on every frame could potentially defeat GL rendering optimizations.

Change-Id: Iebaf579d29ad8f14112c5af8cb5dce8d7f4dfbaf
1 file changed