GitLab

Clip the surface damage rect before adding it to
|damage_rects_union_of_surfaces_on_top_|. This is how we produce
|root_damage_rect_|.

Bug: 1117235
Change-Id: I83b11d2b79490fd072c3bc5484f7cb38a43f2037
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412634
Commit-Queue: Maggie Chen <magchen@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809575}