Refactor decorators into thier own python class

tools/chrome_proxy/webdriver/common.py

 # 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.
 
 import argparse
 import json
 import logging
 import os
 import re
 import socket
@@ skipping 656 matching lines @@
     for test_suite in test_suite_iter:
       for test_case in test_suite:
         for test in test_case:
           # Drop the file name in the form <filename>.<classname>.<methodname>
           test_id = test.id()[test.id().find('.') + 1:]
           if re.match(test_filter_re, test_id):
             tests.addTest(test)
     testRunner = unittest.runner.TextTestRunner(verbosity=2,
       failfast=flags.failfast, buffer=(not flags.disable_buffer))
     testRunner.run(tests)
-
-# Platform-specific decorators.
-# These decorators can be used to only run a test function for certain platforms
-# by annotating the function with them.
-
-def AndroidOnly(func):
-  def wrapper(*args, **kwargs):
-    if ParseFlags().android:
-      func(*args, **kwargs)
-    else:
-      args[0].skipTest('This test runs on Android only.')
-  return wrapper
-
-def NotAndroid(func):
-  def wrapper(*args, **kwargs):
-    if not ParseFlags().android:
-      func(*args, **kwargs)
-    else:
-      args[0].skipTest('This test does not run on Android.')
-  return wrapper
-
-def WindowsOnly(func):
-  def wrapper(*args, **kwargs):
-    if sys.platform == 'win32':
-      func(*args, **kwargs)
-    else:
-      args[0].skipTest('This test runs on Windows only.')
-  return wrapper
-
-def NotWindows(func):
-  def wrapper(*args, **kwargs):
-    if sys.platform != 'win32':
-      func(*args, **kwargs)
-    else:
-      args[0].skipTest('This test does not run on Windows.')
-  return wrapper
-
-def LinuxOnly(func):
-  def wrapper(*args, **kwargs):
-    if sys.platform.startswith('linux'):
-      func(*args, **kwargs)
-    else:
-      args[0].skipTest('This test runs on Linux only.')
-  return wrapper
-
-def NotLinux(func):
-  def wrapper(*args, **kwargs):
-    if sys.platform.startswith('linux'):
-      func(*args, **kwargs)
-    else:
-      args[0].skipTest('This test does not run on Linux.')
-  return wrapper
-
-def MacOnly(func):
-  def wrapper(*args, **kwargs):
-    if sys.platform == 'darwin':
-      func(*args, **kwargs)
-    else:
-      args[0].skipTest('This test runs on Mac OS only.')
-  return wrapper
-
-def NotMac(func):
-  def wrapper(*args, **kwargs):
-    if sys.platform == 'darwin':
-      func(*args, **kwargs)
-    else:
-      args[0].skipTest('This test does not run on Mac OS.')
-  return wrapper