allow flag defines for paint

Bug: skia:
Change-Id: I2c422ac2fe86d9205189119be3f0d51df994596b
Reviewed-on: https://skia-review.googlesource.com/c/183394
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
1 file changed