Add SkFloat2Bits and Region stub

Bug: skia:
Change-Id: I5ab9a4d42e9eec6563499a09e08ed8b183ac91b2
Reviewed-on: https://skia-review.googlesource.com/141426
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
4 files changed