[DevTools] Added public method for async execution of scripts

public/web/WebScriptSource.h

 /*
  * Copyright (C) 2009 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 18 matching lines @@
  */
 
 #ifndef WebScriptSource_h
 #define WebScriptSource_h
 
 #include "../platform/WebString.h"
 #include "../platform/WebURL.h"
 
 namespace blink {
 
+class ScriptSourceCode;
+
 struct WebScriptSource {
     WebString code;
     WebURL url;
     int startLine;
 
     WebScriptSource(const WebString& code)
         : code(code), startLine(1) { }
     WebScriptSource(const WebString& code, const WebURL& url)
         : code(code), url(url), startLine(1) { }
     WebScriptSource(const WebString& code, const WebURL& url, int startLine)
         : code(code), url(url), startLine(startLine) { }
+
+#if BLINK_IMPLEMENTATION
+    operator ScriptSourceCode() const;
+#endif
 };
 
 } // namespace blink
 
 #endif