One more - I know for a fact that this is started (and, hopefully, even almost finished) :)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/192d78833ff9297c754f59f20cb4e590d693a7c2

commit 192d78833ff9297c754f59f20cb4e590d693a7c2
Author: mamir <mamir@chromium.org>
Date: Wed Jun 22 17:10:16 2016

Replace the WAS_INSTALLED_BY_CUSTODIAN creation flag with a pref

Before this CL:
If a custodian-installed extension was already installed in the
browser before the child signs in, the "WasInstalledByCustodian" flag is
stored in Sync was ignored and the default value (false) is used giving
the child the ability to uninstall the extension for example.

After this CL:
The creation flag has been replaced with a pref which is updated
properly upon receiving Sync data.

BUG= 619526 

Review-Url: https://codereview.chromium.org/2054773002
Cr-Commit-Position: refs/heads/master@{#401318}

[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/extension_service.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/extension_service_sync_unittest.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/extension_service_unittest.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/extension_sync_data.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/extension_sync_data.h
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/extension_sync_service.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/extension_util.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/extension_util.h
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/pending_extension_info.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/pending_extension_info.h
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/pending_extension_manager.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/pending_extension_manager.h
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/extensions/updater/extension_updater_unittest.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/safe_browsing/incident_reporting/extension_data_collection.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/supervised_user/supervised_user_service.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/supervised_user/supervised_user_service.h
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/supervised_user/supervised_user_service_unittest.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/sync/test/integration/two_client_apps_sync_test.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/chrome/browser/themes/theme_syncable_service.cc
[modify] https://crrev.com/192d78833ff9297c754f59f20cb4e590d693a7c2/extensions/common/extension.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e960964b7ea2caff5289d4a2f40488af7613389d

commit e960964b7ea2caff5289d4a2f40488af7613389d
Author: mamir <mamir@chromium.org>
Date: Tue Jun 28 22:17:54 2016

Supervised users initiated extensions installs

Supervised users can install apps and extension.  The extension will be
installed in a disabled state and an approval request will be sent to
their custodian.

If the custodian approves the request, the extension will be enabled.
If the custodian denies the request, the extension will be uninstalled.

BUG= 619526 

Review-Url: https://codereview.chromium.org/2004043002
Cr-Commit-Position: refs/heads/master@{#402570}

[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/extensions/extension_service_sync_unittest.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/extensions/extension_service_test_with_install.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/extensions/extension_sync_service.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/extensions/extension_util.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/child_accounts/permission_request_creator_apiary.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/child_accounts/permission_request_creator_apiary.h
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/legacy/permission_request_creator_sync.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/legacy/permission_request_creator_sync.h
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/permission_request_creator.h
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/supervised_user_constants.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/supervised_user_constants.h
[add] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/supervised_user_features.cc
[add] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/supervised_user_features.h
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/supervised_user_pref_store.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/supervised_user_service.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/supervised_user_service.h
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/supervised_user_service_unittest.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/supervised_user_settings_service.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/browser/supervised_user/supervised_user_settings_service.h
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/chrome_browser.gypi
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/chrome_tests.gypi
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/common/pref_names.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/common/pref_names.h
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/test/BUILD.gn
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/test/DEPS
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/test/base/testing_profile.cc
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/chrome/test/base/testing_profile.h
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/extensions/common/extension.h
[modify] https://crrev.com/e960964b7ea2caff5289d4a2f40488af7613389d/tools/metrics/histograms/histograms.xml

This revision https://chromium.googlesource.com/chromium/src.git/+/e960964b7ea2caff5289d4a2f40488af7613389d
doesn't refer to this bug.
The bug was added by mistake to it.

can this be verified yet? or are we waiting on issue 397951

Yes, it's indeed waiting on issue 397951