Correct blend info in case of depth-only pipeline

For depth-only pipelines presence of color attachment is undefined
behaviour. Fix fWritesColor to correctly be set to false for
depth-only draw

Bug: 439531864
Change-Id: I72d7781c7b96446feb97601f18a6330c0f91fd94
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1061176
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Max Kolesin <maxkolesin@google.com>
1 file changed