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This CL describes an experiment to see if a dark blue keyword mode
button will make it more visible and attention-getting.

Bug: 883901
Change-Id: Ibef0b56b1a36f6debae0a446123632e173448c48
Reviewed-on: https://chromium-review.googlesource.com/1234035
Commit-Queue: Kevin Bailey <krb@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594488}