make u32 check runtime

Bug: 848521
Change-Id: Id3deb30447cc5caa27203b46b6b257e76cd88679
Reviewed-on: https://skia-review.googlesource.com/140986
Reviewed-by: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed