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UMA histograms have been added to HintCacheLevelDBStore for tracking the result
of loading the metadata and for tracking status changes within the store.

Change-Id: Iac6cbb37284e48a557469c0fcb13e57f33f97599
Reviewed-on: https://chromium-review.googlesource.com/c/1432893Reviewed-by: Stephen Chenney <schenney@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Commit-Queue: Jered Gray <jegray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625842}