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This CL adds a vertical bar on the left hand side of a suggestion to
indicate focus state. This is gated behind the omnibox-refined-focus-ui
feature flag.

Bug: 1129612
Change-Id: I06dfa60a41e4efceafe6071cb39bfd681a92e106
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446713Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Angela Yoeurng <yoangela@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814404}