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These pieces will be used to store/represent page thumbnails.

Bug: 794828
Change-Id: I242ec8376a36b2b41590bf89fb166a924aa13ca7
Reviewed-on: https://chromium-review.googlesource.com/984952
Commit-Queue: Dan H <harringtond@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547077}