Implement the gattserverdisconnected event.

third_party/WebKit/LayoutTests/resources/bluetooth/bluetooth-helpers.js

 'use strict';
 
 // Bluetooth UUID constants:
 // Services:
 var blacklist_test_service_uuid = "611c954a-263b-4f4a-aab6-01ddb953f985";
+var request_disconnection_service_uuid = "01d7d889-7451-419f-aeb8-d65e7b9277af";
 // Characteristics:
 var blacklist_exclude_reads_characteristic_uuid =
   "bad1c9a2-9a5b-4015-8b60-1579bbbf2135";
 
 // Sometimes we need to test that using either the name, alias, or UUID
 // produces the same result. The following objects help us do that.
 var generic_access = {
   alias: 0x1800,
   name: 'generic_access',
   uuid: '00001800-0000-1000-8000-00805f9b34fb'
@@ skipping 193 matching lines @@
 function runGarbageCollection()
 {
   // Run gc() as a promise.
   return new Promise(
       function(resolve, reject) {
         GCController.collect();
         setTimeout(resolve, 0);
       });
 }
 
+function eventPromise(target, type, options) {
+  return new Promise(resolve => {
+    let wrapper = function(event) {
+      target.removeEventListener(type, wrapper);
+      resolve(event);
+    };
+    target.addEventListener(type, wrapper, options);
+  });
+}
+
 // Creates |num_listeners| promises. Each adds an event listener
 // to object. The promises resolve once the object fires |event| but
 // reject if the event is fired before |object|.|func|() resolves.
 // Returns a promise that fulfills with the result of |object|.|func()|
 // and |event.target.value| of each of the other promises.
 function assert_event_fires_after_promise(object, func, event, num_listeners) {
   num_listeners = num_listeners !== undefined ? num_listeners : 1;
 
   if (object[func] === undefined) {
     return Promise.reject('Function \'' + func + '\' not available in object.');
@@ skipping 101 matching lines @@
 }
 
 // Bluetooth tests sometimes have left-over state that could leak into the
 // next test. add_result_callback which is exposed by testharness.js allows us
 // to clean up this state after each test. Once the move to Mojo is complete
 // we will no longer need to clean up the state manually.
 // https://crbug.com/508771
 add_result_callback(() => {
   setBluetoothFakeAdapter('');
 });