Re: [battery] Allow use in same-origin children, add Feature Policy integration

@anssiko, according to the [test as you commit](https://w3c.github.io/dap-charter/DeviceAPICharter.html#deliverables) policy, would you please add a label "need tests" to this PR?

I will add a corresponding PR in w-p-t to reflect the changes and involve my name in OWNERS file. 
Then revisit current test coverage. :)

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Received on Monday, 23 October 2017 08:05:14 UTC