Electron Releases

Description of Change

Follow-up to #53595, adopting the approach from https://crrev.com/c/8360195 (content::DraggableRegionsToSkRegion).

• #53595 unions each run of consecutive same-kind rects with setRects() and folds the runs in order. That is O(n log n) only while drag/no-drag rects arrive in long runs; when they interleave (a drag card containing a no-drag button, repeated N times) every run is a single rect and the fold is quadratic again.
• This splits the list in halves, builds each half recursively, and combines them as first.result − second.covered + second.result (a point covered by any rect in the second half is decided by the second half alone). Later rects still win; the region is identical to the original sequential loop (checked on 20k randomized inputs), and the cost is O(n log n) region ops however the kinds interleave.
• The helper is a verbatim copy of the one in the CL, with a TODO to replace it with a call to content::DraggableRegionsToSkRegion() once that rolls in.

Release Skia, building the region once from 10k rects:

Checklist

• PR description included
• npm test passes

Release Notes

Notes: none