Stub implementation of Permissions API module.

LayoutTests/http/tests/permissions/resources/test-query.js

+if (self.importScripts) {
+    importScripts('helpers.js');
+
+    if (get_current_scope() == 'ServiceWorker')
+        importScripts('../../serviceworker/resources/worker-testharness.js');
+    else
+        importScripts('../../resources/testharness.js');
+}
+
+async_test(function(test) {
+    Permissions.query('geolocation').then(function() {
+        assert_unreached('Permissions.query() should not succeed (for now).')
+    }, function(e) {
+        assert_true(e instanceof DOMException);
+        assert_equals('NotSupportedError', e.name);
+    }).then(function() {
+        test.done();
+    });
+}, 'Check the Permissions.query() normal behavior in ' + get_current_scope() + ' scope.');
+
+async_test(function(test) {
+    Permissions.query('unknown-keyword').then(function() {
+        assert_unreached('Permissions.query() should not succeed (for now).')
+    }, function(e) {
+        assert_true(e instanceof TypeError);
+        assert_equals('TypeError', e.name);
+    }).then(function() {
+        test.done();
+    });
+}, 'Check the Permissions.query() with wrong keyword in ' + get_current_scope() + ' scope.');
+
+done();