Sort all user-supplied rects before computeFastBounds

https://codereview.chromium.org/908353002 fixed drawRect 2+ years ago, but
drawOval and drawArc were still susceptible. This version ensures that all
rects are sorted before we do the bounds check. Added a new makeSorted
helper to simplify the code, and an assert to catch any future oversight.

All other drawing functions compute their bounds rect in some way that
already ensures it is sorted.

Bug: skia:
Change-Id: I8926b2dbe9d496d0876f1ac5313bd058ae4568b7
Reviewed-on: https://skia-review.googlesource.com/16702
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
4 files changed