Fix assert in shaper.

Need and 'in range' operator.

Change-Id: I57cd6631376a6e857054b4712a70b2aa75a53223
Reviewed-on: https://skia-review.googlesource.com/c/192823
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed