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

(Here's an [HTML diff](https://services.w3.org/htmldiff?doc1=https%3A%2F%2Fw3c.github.io%2Fbattery%2F&doc2=https%3A%2F%2Frawgit.com%2Fw3c%2Fbattery%2Fissue-10-secure-top-level%2Findex.html) comparing [this branch](https://rawgit.com/w3c/battery/issue-10-secure-top-level/index.html) with [gh-pages](https://w3c.github.io/battery/) to ease review, e.g. at F2F. I enabled pr-preview to automate this for any subsequent PRs.)

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Received on Tuesday, 18 September 2018 11:22:39 UTC