Auto merge of #15314 - szeged:permissions-api, r=jdm

Permissions API and WebBluetooth integration

<!-- Please describe your changes on the following line: -->
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.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [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).

<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because

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tests/wpt/mozilla/meta/MANIFEST.json

@@ -24367,7 +24367,7 @@
    "testharness"
   ],
   "mozilla/bluetooth/connect/device-goes-out-of-range.html": [
-   "9e5dc423f92c3f73273d221e7fb7b8d905716db3",
+   "3ade30929f621b7c8c93b87e5392309729d68e42",
    "testharness"
   ],
   "mozilla/bluetooth/connect/get-same-gatt-server.html": [

tests/wpt/mozilla/meta/mozilla/bluetooth/__dir__.ini

@@ -1 +1 @@
-prefs: [dom.bluetooth.enabled:true, dom.bluetooth.testing.enabled:true]
+prefs: [dom.bluetooth.enabled:true, dom.bluetooth.testing.enabled:true, dom.permissions.testing.allowed_in_nonsecure_contexts:true]

tests/wpt/mozilla/meta/mozilla/bluetooth/interfaces.html.ini

@@ -51,18 +51,9 @@
   [BluetoothPermissionResult interface: existence and properties of interface object]
     expected: FAIL
 
-  [BluetoothPermissionResult interface object length]
-    expected: FAIL
-
-  [BluetoothPermissionResult interface object name]
-    expected: FAIL
-
   [BluetoothPermissionResult interface: existence and properties of interface prototype object]
     expected: FAIL
 
-  [BluetoothPermissionResult interface: existence and properties of interface prototype object's "constructor" property]
-    expected: FAIL
-
   [BluetoothPermissionResult interface: attribute devices]
     expected: FAIL
 

tests/wpt/mozilla/tests/mozilla/bluetooth/connect/device-goes-out-of-range.html

@@ -10,8 +10,9 @@ promise_test(t => {
         filters: [{services: [heart_rate.name]}]
     })
     .then(device => {
+        var gatt_server = device.gatt;
         window.testRunner.setBluetoothMockDataSet(adapter_type.empty);
-        return promise_rejects(t, 'NetworkError', device.gatt.connect());
+        return promise_rejects(t, 'NetworkError', gatt_server.connect());
     });
 }, 'Device goes out of range. Reject with NetworkError.');
 </script>