Support toggling flags

Bug: skia:
Change-Id: I1d15f15db2ade0d238d5073cef5b30a3bd5070a5
Reviewed-on: https://skia-review.googlesource.com/68581
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
1 file changed