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This implements the [Permissions API](https://w3c.github.io/permissions/) spec.
Also includes the WebBluetooth related implementation for this.
There are some know issues:
- [ ] If the descriptor name is invalid [this](https://gist.github.com/dati91/7a6a0a563d90f49ba5a351e48c5b626b#file-permissionstatusbindings-rs-L323) will throw an error, rather that return it and we could handle it.
- [x] The [environment settings object](https://html.spec.whatwg.org/multipage/webappapis.html#environment-settings-object) is not implemented in servo and the spec rely on it.
- [x] There is a popup in the implementation which prevent us to add wpt test, we should figure out a way to make it work
- [ ] The allowedDevice's allowed_services attribute is not used in our implementation, because we store these in the lower level, not in the dom side.
- [ ] We think the bluetooth revoke function will need some more work, but the problem is the spec needs clarifications on that part.
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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).
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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because
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Source-Repo: https://github.com/servo/servo
Source-Revision: a537cf48b18d9bba3453b924a4453f5e19dea4ed
--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 50bc944e75966879ab6aca2a6cc229212e733d64
