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The relayout after toggling a checkbox resets the scroll poition, causing a
jarring scroll to start of the list. The fix is to retain the original scroll
position during the layout.

BUG=1000599

Change-Id: I9102c924ac9526ed604124d99677506bca76469f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815537Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
Commit-Queue: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698635}