Introduce SourceLocation to be used for console messages.

third_party/WebKit/Source/bindings/core/v8/ScriptCallStack.cpp

 /*
  * Copyright (c) 2008, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 111 matching lines @@
     value->setInteger("columnNumber", m_stackTrace->topColumnNumber());
     value->endDictionary();
     value->endArray();
 }
 
 String ScriptCallStack::toString() const
 {
     return m_stackTrace->toString();
 }
 
+PassOwnPtr<V8StackTrace> ScriptCallStack::copyStackTrace() const
+{
+    return m_stackTrace ? m_stackTrace->clone() : nullptr;
+}
+
+
 } // namespace blink