Implement WebBluetooth descriptor.readValue()

third_party/WebKit/LayoutTests/bluetooth/script-tests/descriptor/io-op-disconnect-called-during-error.js

+'use strict';
+promise_test(
+    () => {
+      let val = new Uint8Array([1]);
+      return setBluetoothFakeAdapter('FailingGATTOperationsAdapter')
+          .then(
+              () => requestDeviceWithKeyDown(
+                  {filters: [{services: [errorUUID(0xA0)]}]}))
+          .then(device => device.gatt.connect())
+          .then(gattServer => {
+            return gattServer.getPrimaryService(errorUUID(0xA0))
+                .then(service => service.getCharacteristic(errorUUID(0xA1)))
+                .then(
+                    characteristic =>
+                        characteristic.getDescriptor(user_description.name))
+                .then(descriptor => {
+                  let promise = assert_promise_rejects_with_message(
+                      descriptor.CALLS([readValue()]),
+                      new DOMException(
+                          'GATT Server disconnected while performing a GATT operation.',
+                          'NetworkError'));
+                  gattServer.disconnect();
+                  return promise;
+                });
+          });
+    },
+    'disconnect() called during a FUNCTION_NAME call that fails. ' +
+        'Reject with NetworkError.');