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The surface aggregator when computing the damage rect for a surface
tree, computes a bounding box of all the render pass with backdrop
moving filter. It then uses this bounding box to increase the damage
rect of the root render pass. This causes a larger than needed damage
rect to be set. This patch changes the bounding box logic to that of a
list of rects. The damage rect is then expanded based on if it
intersects with a rect in that list.

      Also added unittests.

Bug: 1031914
Test: Manually tested that partial swap now gives correct damage rect.
Change-Id: I4eb8ff29170ddebfa8be79e9fd885551828af0e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1965475
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726083}