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This agent observes the OverlayPresenters at the kInfobarBanner and
kInfobarModal modalities in order to update InfobarBadgeTabHelper state
for infobar overlay UI interaction.  DidShowOverlay() and
DidHideOverlay() are used to update the badge item's presentation
state.

This BrowserAgent performs some ofthe functionality previously
implemented via the InfobarBadgeUIDelegate protocol, which can be
deleted once kInfobarOverlayUI is enabled by default.

This CL also updates FakeOverlayPresentationContext to execute the
presentation callback in ShowOverlayUI().

Bug: 1030357
Change-Id: I153d1a7e7b220587a2582faf29d0942dad6ead2f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1973104
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Auto-Submit: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726962}