[Suggested files] Add metrics to ItemSuggestCache.
This CL finalizes the error/status enum for ItemSuggestCache and adds histogram calls. Bug: 1034842 Change-Id: I952466a377d8e5e2a2dc30e9c8da6f181b80dba4 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434074Reviewed-by:Thanh Nguyen <thanhdng@chromium.org> Reviewed-by:
Steven Holte <holte@chromium.org> Commit-Queue: Tony Yeoman <tby@chromium.org> Cr-Commit-Position: refs/heads/master@{#811563}
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