Implement WebBluetooth getDescriptor[s]

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

Index: third_party/WebKit/LayoutTests/bluetooth/script-tests/gatt-op-disconnect-called-during-error.js
diff --git a/third_party/WebKit/LayoutTests/bluetooth/script-tests/gatt-op-disconnect-called-during-error.js b/third_party/WebKit/LayoutTests/bluetooth/script-tests/gatt-op-disconnect-called-during-error.js
index 2f8363e6186ead4b6b6bea6d71a54ce4679fc00b..7a248ec807c8b78beb298b27d40a75be77bc7574 100644
--- a/third_party/WebKit/LayoutTests/bluetooth/script-tests/gatt-op-disconnect-called-during-error.js
+++ b/third_party/WebKit/LayoutTests/bluetooth/script-tests/gatt-op-disconnect-called-during-error.js
@@ -11,7 +11,11 @@ promise_test(() => {
         .then(error_characteristic => {
           let promise = assert_promise_rejects_with_message(
             error_characteristic.CALLS([
-              readValue()| writeValue(val)| startNotifications()]),
+              getDescriptor(user_description.name)|
+              getDescriptors()|
+              readValue()|
+              writeValue(val)|
+              startNotifications()]),
             new DOMException(
               'GATT Server disconnected while performing a GATT operation.',
               'NetworkError'));