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They are useful when we finch CompositeAfterPaint.

Bug: 1167827
Change-Id: I51fa75f3c32ecbdbff28f199cca15974bedcb4d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643273Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846212}