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This cl contains the set of changes required to show onboarding in a dialog for JITT.
Also this cl shouldn't have any user facing changes.

Bug: b/174445633
Change-Id: Ib52d3175e1713f573624c1af735aab93f6be1f92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2610091Reviewed-by: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Commit-Queue: Rahul Goyal <goyalrahul@google.com>
Cr-Commit-Position: refs/heads/master@{#841123}