Fix tools/dartium/test.py path computation.

tools/dartium/test.py

 #!/usr/bin/env python
 #
 # Copyright 2011 Google Inc. All Rights Reserved.
 
 import fnmatch
 import optparse
 import os
 import re
 import shutil
 import subprocess
@@ skipping 124 matching lines @@
   else:
     suites = [ options.suite ]
 
   # If --checked or --unchecked not present, run with both.
   checkmodes = ['unchecked', 'checked']
   if options.checked or options.unchecked:
     checkmodes = []
     if options.unchecked: checkmodes.append('unchecked')
     if options.checked: checkmodes.append('checked')
 
+  # We are in src/dart/tools/dartium/test.py.
   pathname = os.path.dirname(sys.argv[0])
   fullpath = os.path.abspath(pathname)
-  srcpath = os.path.normpath(os.path.join(fullpath, '..'))
+  srcpath = os.path.normpath(os.path.join(fullpath, '..', '..', '..'))
 
   test_mode = ''
   timeout = 30000
   if mode == 'Debug':
     test_mode = '--debug'
     timeout = 60000
 
   show_results = ''
   if not options.show_results:
     show_results = '--no-show-results'
@@ skipping 75 matching lines @@
     return 1
   else:
     return 0
 
 if __name__ == '__main__':
   try:
     sys.exit(main())
   except StandardError as e:
     print 'Fail: ' + str(e)
     sys.exit(1)