Re: [battery] Allow use in same-origin children, add Feature Policy integration (#13)

Time for the annual update to this issue ☺️

There are the following [battery use counters](https://cs.chromium.org/chromium/src/third_party/blink/public/mojom/web_feature/web_feature.mojom?type=cs&q=BatteryStatusGetBattery&g=0&l=1627) invoked in [getBattery](https://cs.chromium.org/chromium/src/third_party/blink/renderer/modules/battery/navigator_battery.cc?type=cs&g=0&l=32).

In percentages of Chrome page loads (across all channels and platforms) that use the corresponding feature at least once, as of today:

* 18.474067% [BatteryStatusGetBattery](https://www.chromestatus.com/metrics/feature/popularity#BatteryStatusGetBattery)
* 4.141155% [BatteryStatusCrossOrigin](https://www.chromestatus.com/metrics/feature/popularity#BatteryStatusCrossOrigin)
* 1.652762% [BatteryStatusInsecureOrigin](https://www.chromestatus.com/metrics/feature/popularity#BatteryStatusInsecureOrigin)
* 0.004663% [BatteryStatusSameOriginABA](https://www.chromestatus.com/metrics/feature/popularity#BatteryStatusSameOriginABA)

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Received on Friday, 16 August 2019 12:02:47 UTC