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Fetch hints from remote service at the time of navigation.
Hints are fetched only if connection is slow.

Change-Id: I37e13072b17e1adfe9b3365e2dca04ae9bdfc246
Bug: 933898
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829474
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702116}