Handle pipeline creation failure in Dawn

All other backends already have similar logic.

Change-Id: Idc8f1fe0839d5338f4832c04dd036accab20f156
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/378457
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed