Fire window.onerror for uncaught IndexedDB errors

Source/core/dom/DOMError.cpp

 /*
  * Copyright (C) 2012 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 22 matching lines @@
     : m_name(name)
 {
 }
 
 DOMError::DOMError(const String& name, const String& message)
     : m_name(name)
     , m_message(message)
 {
 }
 
+String DOMError::toStringForConsole() const
+{
+    return name() + ": " + message();
+}
+
 } // namespace blink