Route Dawn shader compile errors through the error handler

Change-Id: Ia7fb5dfc0239ab0fdd3259246b727b7f901dca7b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/372017
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed