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Add comments clarify the reason that the DrawQuadList is not cleared
by the CALayer overlay processor (the RenderPassDrawQuads are sill
referenced).

Add a TODO for the place to add the underlay processor.

Bug: 1152849
Change-Id: Iaf58b2c4ebbadf29c40ed76660069f9d0932a995
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587949
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Chris Blume <cblume@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839808}