Allow the Triangulator to fail

Bug: 1262444
Change-Id: I951c1809c031c1c8e71d8c3ce1be3506bbfa3d2c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/469904
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
6 files changed