Check that mask to path fallback happens

BUG=chromium:876767

Change-Id: I6aadf329af836a1e03aa85b34a58830be00ff750
Reviewed-on: https://skia-review.googlesource.com/150135
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Khusal Sagar <khushalsagar@chromium.org>
3 files changed