Update fully lazy proxy checks to look for negative w/h

Bug: chromium:1000004
Change-Id: I73fcd98682853a057d8ee6a1c224bf43587f906a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/240691
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2 files changed