GitLab

demo mode setup flow.

* Change DemoSetupController delegate into callback passed to Enroll()
* Pass info about enrollment type separately from Enroll() request
* Store DemoSetupController instance in WizardController instead of
  DemoSetupScreen for easier storage and access to demo setup flow status

Change-Id: I43f2f28dfc2daea519849d222ea5a73561522516
Bug: 862445
Test: Run DemoSetupTest, DemoSetupControllerTest and wizard_controller_browsertest.
Reviewed-on: https://chromium-review.googlesource.com/1155152
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580937}