Implement WebBluetooth descriptor.readValue()

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

+promise_test(() => {
+  return setBluetoothFakeAdapter('GATTOperationFailsAfterReconnectionAdapter')
+    .then(() => requestDeviceWithKeyDown({
+      filters: [{services: ['health_thermometer']}]}))
+    .then(device => device.gatt.connect())
+    .then(gatt => gatt.getPrimaryService('health_thermometer'))
+    .then(service => service.getCharacteristic('measurement_interval'))
+    .then(characteristic => characteristic.getDescriptor('gatt.characteristic_user_description'))
+    .then(descriptor => {
+      let promise = assert_promise_rejects_with_message(
+        descriptor.CALLS([
+          readValue()
+          ]),
+        new DOMException('GATT Server disconnected while performing a GATT operation.',
+                         'NetworkError'));
+      let gatt = descriptor.characteristic.service.device.gatt;
+      gatt.disconnect();
+      return gatt.connect().then(() => promise);
+    });
+}, 'disconnect() and connect() called during a FUNCTION_NAME call that ' +
+   'fails. Reject with NetworkError.');