Fix mask/image filter bounds calculation for inverse-filled paths

Bug: skia:12587, skia:10959
Change-Id: I43dea5f2d2f54c7db47e778ac9c7bac53ae4998d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/509176
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
8 files changed