Mark FreeType bitmap font bounds as unknown.

In FreeType bitmap strikes don't have any inexpensive conservative
bounds. The existing code was covering for this by guessing at some
possible likely bounds, but they are likely to be wrong. Leave the old
guess but mark these bounds as unreliable to prevent bogus clipping when
used in relation to text blobs.

Change-Id: I6eb4448bf40237ac0b15aec6c06c98025d1e58b1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/316219
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed