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Instead of relying on SceneState order calls, which cannot be
guaranteed, a new AppState shouldShowDefaultBrowserPromo property is
added to keep track of when a resumption of session is due to a cold
start.

A new DefaultBrowserSceneAgent class will listen to SceneActivationLevel
and check the shouldShowDefaultBrowserPromo property to determine
when to show the promo.

Also, an iOS14 check is added to IsLikelyInterestedDefaultBrowserUser to
ensure that only users on iOS14 see this promo.

Bug: 1107489
Change-Id: I71c77a98e20644c620f4c4d3c60cb0b253931cc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378710
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805357}