don't rely on GlyphRunList for position

Change-Id: Ia8ad1851400d677ca6a65f9927322697f5e69102
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/471762
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
3 files changed