Factor out modifier-token parsing into helper function.

Change-Id: I45a53e70c7be9d1e5d060ed78e2cc9603a2a4637
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/356918
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
1 file changed