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Rather, wait to record until the user exits the tab switcher to try to
record. The user must exist the tab switcher on the tab for which
results were returned.

Also logs a histogram indicating whether results were returned while the
user was in the tab switcher so that we can ballpark estimate
adjustments needed to M69 metrics.

BUG=890366

Change-Id: Ic5726907911df15d4bc6a5cbd97633fcf7415595
Reviewed-on: https://chromium-review.googlesource.com/1252627Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595852}