Implement WebBluetooth getDescriptor[s]

third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic/descriptor-garbage-collection-ran-during-error.js

 'use strict';
 promise_test(() => {
-  let val = new Uint8Array([1]);
   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(measurement_interval => {
+    .then(characteristic => {
       promise = assert_promise_rejects_with_message(
-        measurement_interval.CALLS([
-          readValue()|
-          writeValue(val)|
-          startNotifications()|
-          stopNotifications()]),
+        /* 0x0101 doesn't exist in this characteristic */

[ortuno, 2016/12/07 08:05:12]

hmm you moved this to another file but you kept the same error message. Either
change the error message to be descriptor specific or move this to
gatt-op-garbage-collection-ran-during-error.js

[dougt, 2016/12/07 19:48:57]

Done.

+        characteristic.CALLS([
+          getDescriptor(0x0101)|
+          getDescriptors()|
+          getDescriptors(0x0101)[UUID]]),
         new DOMException(
           'GATT Server disconnected while performing a GATT operation.',
           'NetworkError'));
       // Disconnect called to clear attributeInstanceMap and allow the
       // object to get garbage collected.
-      measurement_interval.service.device.gatt.disconnect();
+      characteristic.service.device.gatt.disconnect();
     })
     .then(runGarbageCollection)
     .then(() => promise);
-}, 'Garbage collection ran during a FUNCTION_NAME call that succeeds. ' +
-   'Should not crash.');
+}, 'Garbage Collection ran during FUNCTION_NAME call that fails. ' +
+   'Should not crash');