Draw glyphs from paths if they have an empty path.

This distuguishes between glyphs which do not have a path and glyphs
which have a path but that path resolves to the empty path.

BUG=chromium:816763

Change-Id: Id6c7dd66cdad3868bf3fe15bcb6e5e6f2ca82405
Reviewed-on: https://skia-review.googlesource.com/112484
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
3 files changed