bluetooth: show better error messages for services, characteristics and descriptors

third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTDescriptor.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BluetoothRemoteGATTDescriptor_h
 #define BluetoothRemoteGATTDescriptor_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/DOMArrayPiece.h"
 #include "core/dom/DOMDataView.h"
@@ skipping 49 matching lines @@
   }
 
   void ReadValueCallback(ScriptPromiseResolver*,
                          mojom::blink::WebBluetoothResult,
                          const Optional<Vector<uint8_t>>&);
 
   void WriteValueCallback(ScriptPromiseResolver*,
                           const Vector<uint8_t>&,
                           mojom::blink::WebBluetoothResult);
 
+  DOMException* createInvalidDescriptorError();
+
   mojom::blink::WebBluetoothRemoteGATTDescriptorPtr m_descriptor;
   Member<BluetoothRemoteGATTCharacteristic> m_characteristic;
   Member<DOMDataView> m_value;
 };
 
 }  // namespace blink
 
 #endif  // BluetoothRemoteGATTDescriptor_h