Remove unreliable SW mask caching assert

The key for the cached mask allows some slop in the subpixel
positioning of the mask. This means that, in rare circumstances,
the cached, integer draw-rect can differ from what would've been
computed directly.

Bug: 1143674
Change-Id: I1a0f47c0f8030c692bb737f8386da77348046af5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/330410
Reviewed-by: Adlai Holler <adlai@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed