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This change adds a syncable pref for app notification badging that can
be toggled in the notification quick settings.

When the pref is changed, all app badges in the shelf and app list are
updated. The badges are hidden when the pref is disabled.

Bug: 1080827, 1122723
Change-Id: Icd3ff5562e768cfc8e07c9173263c326f1e66d67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366295
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804501}