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The SplitSettingsSync feature makes it possible to independently
sync Chrome apps (via browser sync) and ARC apps (via OS sync).
The app list data model and UI code can handle references to
missing apps (for example, on Chromebooks that don't support ARC++
the app list data model may have references to ARC++ apps from
sync, but the UI gracefully hides them).

I initially tied the APP_LIST data type to OS apps. However, the
user can end up in an odd state if we sync Chrome apps
without syncing the app list metadata. For example, a user could
disable OS sync, enable browser sync, install some Chrome
apps, move them around in the app list, set up a new Chromebook,
then discover that the apps are in the wrong order or are not
pinned to the shelf.

Ensure we sync the metadata if either browser apps or OS apps are
being synced.

Bug: 1013466
Test: added to sync_integration_tests

Change-Id: Iddc13a978bb84259fadf91fe5fd9454606ba650d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1931098
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720582}