[Telemetry] Move discover to common/py_utils

common/py_utils/py_utils/discover.py

 # Copyright 2012 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 fnmatch
 import inspect
 import os
 import re
 import sys
 
@@ skipping 139 matching lines @@
     if obj.__module__ != module.__name__:
       continue
 
     if index_by_class_name:
       key_name = camel_case.ToUnderscore(obj.__name__)
     else:
       key_name = module.__name__.split('.')[-1]
     if not directly_constructable or IsDirectlyConstructable(obj):
       if key_name in classes and index_by_class_name:
         assert classes[key_name] is obj, (
-          'Duplicate key_name with different objs detected: '
-          'key=%s, obj1=%s, obj2=%s' % (key_name, classes[key_name], obj))
+            'Duplicate key_name with different objs detected: '
+            'key=%s, obj1=%s, obj2=%s' % (key_name, classes[key_name], obj))
       else:
         classes[key_name] = obj
 
   return classes
 
 
 def IsDirectlyConstructable(cls):
   """Returns True if instance of |cls| can be construct without arguments."""
   assert inspect.isclass(cls)
   if not hasattr(cls, '__init__'):
     # Case |class A: pass|.
     return True
   if cls.__init__ is object.__init__:
     # Case |class A(object): pass|.
     return True
   # Case |class (object):| with |__init__| other than |object.__init__|.
   args, _, _, defaults = inspect.getargspec(cls.__init__)
   if defaults is None:
     defaults = ()
   # Return true if |self| is only arg without a default.
   return len(args) == len(defaults) + 1
 
 
-_counter = [0]
+_COUNTER = [0]
 
 
 def _GetUniqueModuleName():
-  _counter[0] += 1
-  return "module_" + str(_counter[0])
+  _COUNTER[0] += 1
+  return "module_" + str(_COUNTER[0])