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This change enables processing of URL-keyed hints that are returned
from the remote optimization guide. It also add an in-memory cache
for these hints within the hint cache for their use by the
optimization guide and its consumers.

Future changes will allow the fetch of hints based on the current
navigation and enable their use for future consumers.

Bug: 1036490
Change-Id: I843043ff26541cad687a65899e9542c32823dde4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1987226Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729825}