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AdapterPoweredChanged gets called right after AdapterPresentChanged when
an adapter is added or removed. This causes us to call
Observer::OnBluetoothStateChanged() a second time without the state
actually changing. To avoid this, we cache the state whenever
AdapterPresentChanged and AdapterPoweredChanged get called and only notify
if the new state is different than the cached state.

Bug: 908879
Change-Id: I7ca48b20678b5336346955fd2254bc68f2a09b75
Reviewed-on: https://chromium-review.googlesource.com/c/1352123
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611911}