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This is useful for PCScan since it enables the scanning routine to use a
bitmap for super-page lookup.

Bug: 11297512
Change-Id: I1634f0a97a1dd85e3407d80da6cd43e362476062
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627147
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842970}