Check file name valid or not.

Change-Id: Ia122050cabf68671c27e8aef3c69ec038c790899
Reviewed-on: https://skia-review.googlesource.com/130461
Commit-Queue: Ben Wagner <bungeman@google.com>
Commit-Queue: Bruce Wang <brucewang@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
1 file changed