Implement WebBluetooth descriptor.readValue()

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

+promise_test(
+    () => {
+      let val = new Uint8Array([1]);
+      return setBluetoothFakeAdapter(
+                 'GATTOperationSucceedsAfterReconnectionAdapter')
+          .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(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'));
+            let gatt = descriptor.characteristic.service.device.gatt;
+            gatt.disconnect();
+            return gatt.connect().then(() => promise);
+          });
+    },
+    'disconnect() and connect() called during a FUNCTION_NAME call that ' +
+        'succeeds. Reject with NetworkError.');