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This CL adds the "settings.restore_apps_and_pages" preference item to
prepare for the full restore feature.
DD: go/chrome-os-full-restore-dd

BUG=1146900

Change-Id: I259cc7fac01e77407337dbc2942ef645191c6057
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533213
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826594}