Add experimental framework token generation tool

tools/origin_trials/PRESUBMIT.py

-# Copyright 2015 The Chromium Authors. All rights reserved.
+# Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 def _CommonChecks(input_api, output_api):
   results = []
 
   # Run Pylint over the files in the directory.
   pylint_checks = input_api.canned_checks.GetPylint(input_api, output_api)
   results.extend(input_api.RunTests(pylint_checks))
 
-  # Run the MB unittests.
+  # Run the generate_token unittests.
   results.extend(input_api.canned_checks.RunUnitTestsInDirectory(
       input_api, output_api, '.', [ r'^.+_unittest\.py$']))
 
-  # Validate the format of the mb_config.pyl file.
-  cmd = [input_api.python_executable, 'mb.py', 'validate']
-  kwargs = {'cwd': input_api.PresubmitLocalPath()}
-  results.extend(input_api.RunTests([
-      input_api.Command(name='mb_validate',
-                        cmd=cmd, kwargs=kwargs,
-                        message=output_api.PresubmitError)]))
-
   return results
 
 
 def CheckChangeOnUpload(input_api, output_api):
   return _CommonChecks(input_api, output_api)
 
 
 def CheckChangeOnCommit(input_api, output_api):
   return _CommonChecks(input_api, output_api)