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This change adds a CanPower() method to BluetoothAdapter. By default it
simply delegates to IsPresent(), but it is overriden for WinRT, where we
can be in a state where we were able to get accesss to the adapter, but
not the underlying radio.

Bug: 821766
Change-Id: I46544d542b49a73f7876a10daccb6d78c492b36c
Reviewed-on: https://chromium-review.googlesource.com/1189903
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586248}