Add SkIRect::adjust method

Change-Id: Ib18d1a82944524e20d5d72912d8db7a823c470de
Reviewed-on: https://skia-review.googlesource.com/128884
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
4 files changed