This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

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msw, were you working on something similar?

If not, please mark Available with no owner.

Scott, can you clarify masktobounds? I don't see that in code search.
Perhaps the WindowTree::SetHitTestMask impl I added in  Issue 872891  is sufficient?
Or perhaps  Issue 613210  to support non-rect SkPath Widget hit test regions covers the remainder?

This was originally for SetHitTestMask, but I've since changed that around such that I don't think this matters anymore. Closing out.