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Currently, the SlotMetadata records the allocation offset in the
returned page; however, it's only ever used to calculate the final
allocation address. Instead, just store the allocation address.

Bug: 896019
Change-Id: Id14a15e4a7c9afdeb4a517b85a90ddb9f30f7a9f
Reviewed-on: https://chromium-review.googlesource.com/c/1318404
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605548}