Implement WebBluetooth descriptor.readValue()

third_party/WebKit/LayoutTests/bluetooth/script-tests/descriptor/io-op-garbage-collection-ran-during-success.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 =>
+                  characteristic.getDescriptor(user_description.name))
+          .then(descriptor => {
+            promise = assert_promise_rejects_with_message(
+                descriptor.CALLS([readValue()]),
+                new DOMException(
+                    'GATT Server disconnected while performing a GATT operation.',
+                    'NetworkError'));
+            // Disconnect called to clear attributeInstanceMap and allow the
+            // object to get garbage collected.
+            descriptor.characteristic.service.device.gatt.disconnect();
+          })
+          .then(runGarbageCollection)
+          .then(() => promise);
+    },
+    'Garbage collection ran during a FUNCTION_NAME call that succeeds. ' +
+        'Should not crash.');