Added positions to DSLParser layout processing

This allows for correct line number information in errors relating
to layouts.

Change-Id: I8df02f434d3565cb466074742780424b67ce4a8d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/443240
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
1 file changed