bluetooth: Improve error message for retrieving Descriptors when disconnecting

third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic/descriptor-device-disconnects-during-error.js

Index: third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic/descriptor-device-disconnects-during-error.js
diff --git a/third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic/descriptor-device-disconnects-during-error.js b/third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic/descriptor-device-disconnects-during-error.js
new file mode 100644
index 0000000000000000000000000000000000000000..8538ac938b00b754dd214227e0da2b9af3f6a92c
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic/descriptor-device-disconnects-during-error.js
@@ -0,0 +1,32 @@
+'use strict';
+promise_test(
+    () => {
+      let val = new Uint8Array([1]);
+      return setBluetoothFakeAdapter('FailingGATTOperationsAdapter')
+          .then(() => requestDeviceWithKeyDown({
+                  filters: [{services: [errorUUID(0xA0)]}],
+                  optionalServices: [request_disconnection_service_uuid]
+                }))
+          .then(device => device.gatt.connect())
+          .then(gattServer => {
+            let error_characteristic;
+            return gattServer.getPrimaryService(errorUUID(0xA0))
+                .then(es => es.getCharacteristic(errorUUID(0xA1)))
+                .then(ec => error_characteristic = ec)
+                .then(() => get_request_disconnection(gattServer))
+                .then(requestDisconnection => {
+                  requestDisconnection();
+                  return assert_promise_rejects_with_message(
+                      error_characteristic.CALLS(
+                          [getDescriptor(user_description.name) |
+                           getDescriptors(user_description.name)[UUID] |
+                           getDescriptors()]),
+                      new DOMException(
+                          'GATT Server is disconnected. Cannot retrieve descriptors. ' +
+                              '(Re)connect first with `device.gatt.connect`.',
+                          'NetworkError'));
+                });
+          });
+    },
+    'Device disconnects during a FUNCTION_NAME call that fails. ' +
+        'Reject with NetworkError.');