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This fix race condition when settings are driven by mojo instance
creation for intent helper and onArcInitialStart is called due the
communication via auth mojom. That leads to case when onArcInitialStart
is not called for arc settings and these settings are not applied on
Android side.

Bug: 822459
Test: Unit tests added. Manually on device. Simulate race condition,
observer that all consumers of onArcInitialStart are called. Only
settings component has such race. Other consumers are created on
session start and do not have this race.

Change-Id: Iab0a5fe53d55c3e84fbe532cf7c8d5b720e67bcb
Reviewed-on: https://chromium-review.googlesource.com/967069
Commit-Queue: Yury Khmel <khmel@google.com>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549204}