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This CL adds a pref to track if onboarding was run by this user before.
If it has not, when enabling for the first time, onboarding is run first
by navigating to the subpage and showing in a dialog. Once onboarding
has been done once, the user can freely toggle on/off without
triggering onboarding. However, onboarding will still run if the user
triggers the pod button and the feature is disabled. This matches the
Android behavior.

Additionally, this CL fixes a bug with the premature closing of the
shared receiveManager which needs to stay alive and connected after the
dialog closes otherwise getReceiveManager returns a remote with a closed
pipe.

Bug: b/154866951
Change-Id: I1e3cbd15f4995f019b3476c2f7a69f67d6eb1888
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424763Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#809623}