Refactor decorators into thier own python class

tools/chrome_proxy/webdriver/decorators.py

Index: tools/chrome_proxy/webdriver/decorators.py
diff --git a/tools/chrome_proxy/webdriver/decorators.py b/tools/chrome_proxy/webdriver/decorators.py
new file mode 100644
index 0000000000000000000000000000000000000000..5da3650523d7dc0cbfe7a41c8f4e27ee38b0440b
--- /dev/null
+++ b/tools/chrome_proxy/webdriver/decorators.py
@@ -0,0 +1,74 @@
+# Copyright 2017 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.
+
+from common import ParseFlags
+
+
+# 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