replace GlyphRunList with its origin for draw()

This change will make unifying code easier in future CLs.

Change-Id: I981b99ba4da6762702adfcb26165c1d3065339f7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/474896
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
3 files changed