check for bad strings in readFlattenable

Bug:792815
Change-Id: I3b79d8b182bd129e9a17185991020d1dafb66a34
Reviewed-on: https://skia-review.googlesource.com/82060
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed