Add support for running the profiler output processing scripts with node.

tools/csvparser.js

 // Copyright 2009 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 58 matching lines @@
         // The second field pattern will match anything, thus
         // in the worst case the match will be an empty string.
         var field = fieldMatch[2];
         pos += field.length + 1;  // Skip comma.
         fields.push(field);
       }
     } while (pos <= endPos);
   }
   return fields;
 };
+
+// Node exports
+if (typeof module !== 'undefined' && module.exports) {
+  module.exports = CsvParser;
+}