Added line numbers to some DSLParser errors that were missing them

We were reporting immediate errors in this function at the correct
location, but by not setting the offset of the statement itself, later
errors discovered during analysis were being reported with no line
number.

Change-Id: I7f4c5a0db774bbcf3901b38e05a43cebbda0d1ed
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/445102
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
1 file changed