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This only holds the hint data for now. Another CL to follow will use it.
Moves the recently added activation list into the hint cache as well.

Bug: 867651
Change-Id: I188cab0b8539439d859186eecc8185a66ba34efb
Reviewed-on: https://chromium-review.googlesource.com/1150739
Commit-Queue: Doug Arnett <dougarnett@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579842}