Implement WebBluetooth getDescriptor[s]

third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic/descriptor-blocklisted.js

+'use strict';
+promise_test(() => {
+  let promise;
+  return setBluetoothFakeAdapter('DisconnectingHealthThermometerAdapter')
+    .then(() => requestDeviceWithKeyDown({
+      filters: [{services: ['health_thermometer']}]}))
+    .then(device => device.gatt.connect())
+    .then(gattServer => gattServer.getPrimaryService('health_thermometer'))
+    .then(service => service.getCharacteristic('measurement_interval'))
+    .then(characteristic => {
+      return assert_promise_rejects_with_message(
+        // Using UUIDs instead of names to avoid making a name<>uuid mapping.
+        characteristic.CALLS([
+          getDescriptor('bad2ddcf-60db-45cd-bef9-fd72b153cf7c')|
+          getDescriptors('bad2ddcf-60db-45cd-bef9-fd72b153cf7c')]),
+          new DOMException('getDescriptor(s) called with blocklisted UUID. ' +
+                         'https://goo.gl/4NeimX',
+              'SecurityError'));
+    })
+}, 'Making sure FUNCTION_NAME can not access blocklisted descriptors.');