Clean up gclient MergeDependencies

gclient_utils.py

 # Copyright (c) 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.
 
 """Generic utils."""
 
 import codecs
 import logging
 import os
 import pipes
@@ skipping 883 matching lines @@
 
   Python on OSX 10.6 raises a NotImplementedError exception.
   """
   try:
     import multiprocessing
     return multiprocessing.cpu_count()
   except:  # pylint: disable=W0702
     # Mac OS 10.6 only
     # pylint: disable=E1101
     return int(os.sysconf('SC_NPROCESSORS_ONLN'))
+
+
+class BaseRecord(object):
+  """Base class for objects with equality by value."""
+  @property
+  def __key__(self):
+    return (self.__class__, tuple(self.__dict__.iteritems()))
+
+  def __eq__(self, other):
+    return self.__key__ == getattr(other, '__key__', None)
+
+  def __hash__(self):
+    return hash(self.__key__)