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

tools/splaytree.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 307 matching lines @@
 /**
  * @type {SplayTree.Node}
  */
 SplayTree.Node.prototype.left = null;
 
 
 /**
  * @type {SplayTree.Node}
  */
 SplayTree.Node.prototype.right = null;
+
+// Node exports
+if (typeof module !== 'undefined' && module.exports) {
+  module.exports = SplayTree;
+}