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This will make it easier to consolidate the logic when the components
are split into different widgets.

Change-Id: I367bee362632ad015f73c1da8637ac71942bdc9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674657
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672609}