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Add --show-aggregated-damage command line flag which activates a red
highlight around the damage rect for the final aggregated
CompositorFrame.  It can be difficult to diagnose damage rect related
problems so this may prove useful for debugging.

DamageFrameAnnotator has the ability to draw an arbitrary number of
DebugBorderDrawQuads even though it only produces one. This is
intentional so it can easily be extended for other debugging tasks.

Bug: none
Change-Id: I4f97009b139978b228eaf58d70ebdc5c88f88f6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717230Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682281}