bluetooth: Better disconnected error messages for GATT operations.

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

 // Copyright 2014 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 BluetoothError_h
 #define BluetoothError_h
 
 #include "platform/heap/Handle.h"
 #include "third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom-blink.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 // Used when generating DOMExceptions specific to each operation.
-// TODO(crbug.com/684445): Add DescriptorsRetrieval and GATTOperation.
+// TODO(crbug.com/684445): Add DescriptorsRetrieval.
 enum class BluetoothOperation {
   ServicesRetrieval,
   CharacteristicsRetrieval,
+  GATT,
 };
 
 // These error codes requires detailed error messages.
 enum class BluetoothErrorCode {
   InvalidService,
   InvalidCharacteristic,
   InvalidDescriptor,
   ServiceNotFound,
   CharacteristicNotFound,
   DescriptorNotFound
@@ skipping 11 matching lines @@
   static DOMException* createDOMException(BluetoothErrorCode,
                                           const String& detailedMessage);
 
   static DOMException* createDOMException(
       mojom::blink::WebBluetoothResult error);
 };
 
 }  // namespace blink
 
 #endif  // BluetoothError_h