bug:22806069
Shadow effect is not visible if the shadowRadius is set
between 0.1 and 1.0.
Cherry-pick of 8d9b5fbd from AOSP
Change-Id: Ifff71f44d66ba604bd751bb1df96a9904ae7998e
Also, when converting radius to an integer value snap to the appropriate integer boundaries.
bug: 10650594
Change-Id: Icca4bc17d88162bbcbc6035d4f81bd1d98a4de2d