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This class now supports:
- enabling/disabling a FullscreenModel,
- sending broadcast values,
- and notifying observers of service shutdown.

Bug: none
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I6d0b6964599aee1606dd992577ddc43d4ce43a4d
Reviewed-on: https://chromium-review.googlesource.com/1185977
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585657}