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diff --git a/third_party/py/gflags/gflags/flags_modules_for_testing/module_foo.py b/third_party/py/gflags/gflags/flags_modules_for_testing/module_foo.py
new file mode 100644
index 0000000000..34e464d297
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+++ b/third_party/py/gflags/gflags/flags_modules_for_testing/module_foo.py
@@ -0,0 +1,141 @@
+#!/usr/bin/env python
+# Copyright 2009 Google Inc. All Rights Reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Auxiliary module for testing gflags.py.
+
+The purpose of this module is to define a few flags, and declare some
+other flags as being important.  We want to make sure the unit tests
+for gflags.py involve more than one module.
+"""
+
+__author__ = 'salcianu@google.com (Alex Salcianu)'
+
+import gflags
+import _helpers
+from gflags.flags_modules_for_testing import module_bar
+
+FLAGS = gflags.FLAGS
+
+
+DECLARED_KEY_FLAGS = ['tmod_bar_x', 'tmod_bar_z', 'tmod_bar_t',
+                      # Special (not user-defined) flag:
+                      'flagfile']
+
+
+def DefineFlags(flag_values=FLAGS):
+  """Defines a few flags."""
+  module_bar.DefineFlags(flag_values=flag_values)
+  # The 'tmod_foo_' prefix (short for 'test_module_foo') ensures that we
+  # have no name clash with existing flags.
+  gflags.DEFINE_boolean('tmod_foo_bool', True, 'Boolean flag from module foo.',
+                       flag_values=flag_values)
+  gflags.DEFINE_string('tmod_foo_str', 'default', 'String flag.',
+                      flag_values=flag_values)
+  gflags.DEFINE_integer('tmod_foo_int', 3, 'Sample int flag.',
+                       flag_values=flag_values)
+
+
+def DeclareKeyFlags(flag_values=FLAGS):
+  """Declares a few key flags."""
+  for flag_name in DECLARED_KEY_FLAGS:
+    gflags.DECLARE_key_flag(flag_name, flag_values=flag_values)
+
+
+def DeclareExtraKeyFlags(flag_values=FLAGS):
+  """Declares some extra key flags."""
+  gflags.ADOPT_module_key_flags(module_bar, flag_values=flag_values)
+
+
+def NamesOfDefinedFlags():
+  """Returns: list of names of flags defined by this module."""
+  return ['tmod_foo_bool', 'tmod_foo_str', 'tmod_foo_int']
+
+
+def NamesOfDeclaredKeyFlags():
+  """Returns: list of names of key flags for this module."""
+  return NamesOfDefinedFlags() + DECLARED_KEY_FLAGS
+
+
+def NamesOfDeclaredExtraKeyFlags():
+  """Returns the list of names of additional key flags for this module.
+
+  These are the flags that became key for this module only as a result
+  of a call to DeclareExtraKeyFlags() above.  I.e., the flags declared
+  by module_bar, that were not already declared as key for this
+  module.
+
+  Returns:
+    The list of names of additional key flags for this module.
+  """
+  names_of_extra_key_flags = list(module_bar.NamesOfDefinedFlags())
+  for flag_name in NamesOfDeclaredKeyFlags():
+    while flag_name in names_of_extra_key_flags:
+      names_of_extra_key_flags.remove(flag_name)
+  return names_of_extra_key_flags
+
+
+def RemoveFlags(flag_values=FLAGS):
+  """Deletes the flag definitions done by the above DefineFlags()."""
+  for flag_name in NamesOfDefinedFlags():
+    module_bar.RemoveOneFlag(flag_name, flag_values=flag_values)
+  module_bar.RemoveFlags(flag_values=flag_values)
+
+
+def GetModuleName():
+  """Uses GetCallingModule() to return the name of this module.
+
+  For checking that _GetCallingModule works as expected.
+
+  Returns:
+    A string, the name of this module.
+  """
+  return _helpers.GetCallingModule()
+
+
+def DuplicateFlags(flagnames=None):
+  """Returns a new FlagValues object with the requested flagnames.
+
+  Used to test DuplicateFlagError detection.
+
+  Args:
+    flagnames: str, A list of flag names to create.
+
+  Returns:
+    A FlagValues object with one boolean flag for each name in flagnames.
+  """
+  flag_values = gflags.FlagValues()
+  for name in flagnames:
+    gflags.DEFINE_boolean(name, False, 'Flag named %s' % (name,),
+                         flag_values=flag_values)
+  return flag_values
+
+
+def DefineBarFlags(flag_values=FLAGS):
+  """Defines flags from module_bar."""
+  module_bar.DefineFlags(flag_values)