Report the correct line number when vardecls have an error.

Previously, the Type's fOffset was set to -1 during parsing, so any
errors related to the Type would be reported on line 1.

Change-Id: I9834f733bc763c5946b3ff81d8aef4807cdc13d1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/335584
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
7 files changed