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This CL uses the existing status AVAILABLE_LOADING to signal to the UI
that the currently available suggestions are stale and that new ones are
being loaded. When the fetch is over (or when it fails or when a timeout
fires), the category status is switched back to AVAILABLE.

Bug: 762932
Change-Id: If34d739ab316adec95f8e4e8f4b5319479fdacd5
Reviewed-on: https://chromium-review.googlesource.com/663729
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: vitaliii <vitaliii@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Tim Schumann <tschumann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506795}