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This CL changes the default app order according to
PRD at go/default-apps.
It also introduces a mechanism to add default page breaks
that are part of the default sort order so that we're
able to make default apps span multiple pages if desired.
Default page breaks should only be installed for first-time
users, or users who already have them in their remote sync
data.

BUG=880506
TEST=Manually by installing an image on device, also added a test.

Change-Id: I4882e3a6b76b81862686b2eba0d1bd76d0ec4b35
Reviewed-on: https://chromium-review.googlesource.com/1212704
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595681}