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- Queries AutocompleteController when the realbox gets focus and is empty.
- Stops AutocompleteController and clears Autocomplete results when
  realbox loses focus. Otherwise previous non-zero-prefix suggestions
  remain cached.
- Displays the clock icon for the personalized zero-prefix suggestions, if
  applicable.

Bug: 996516
Change-Id: Ib821e0f6f0e5b722f60b6388456c673a7b8b450b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786592
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694829}