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diff --git a/third_party/py/abseil/absl/flags/__init__.py b/third_party/py/abseil/absl/flags/__init__.py
new file mode 100644
index 0000000000..8f78711398
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+++ b/third_party/py/abseil/absl/flags/__init__.py
@@ -0,0 +1,148 @@
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""This package is used to define and parse command line flags.
+
+This package defines a *distributed* flag-definition policy: rather than
+an application having to define all flags in or near main(), each Python
+module defines flags that are useful to it.  When one Python module
+imports another, it gains access to the other's flags.  (This is
+implemented by having all modules share a common, global registry object
+containing all the flag information.)
+
+Flags are defined through the use of one of the DEFINE_xxx functions.
+The specific function used determines how the flag is parsed, checked,
+and optionally type-converted, when it's seen on the command line.
+"""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import getopt
+import os
+import re
+import sys
+import types
+import warnings
+
+from absl.flags import _argument_parser
+from absl.flags import _defines
+from absl.flags import _exceptions
+from absl.flags import _flag
+from absl.flags import _flagvalues
+from absl.flags import _helpers
+from absl.flags import _validators
+import six
+
+# Initialize the FLAGS_MODULE as early as possible.
+# It's only used by adopt_module_key_flags to take SPECIAL_FLAGS into account.
+_helpers.FLAGS_MODULE = sys.modules[__name__]
+
+# Add current module to disclaimed module ids.
+_helpers.disclaim_module_ids.add(id(sys.modules[__name__]))
+
+# DEFINE functions. They are explained in more details in the module doc string.
+# pylint: disable=invalid-name
+DEFINE = _defines.DEFINE
+DEFINE_flag = _defines.DEFINE_flag
+DEFINE_string = _defines.DEFINE_string
+DEFINE_boolean = _defines.DEFINE_boolean
+DEFINE_bool = DEFINE_boolean  # Match C++ API.
+DEFINE_float = _defines.DEFINE_float
+DEFINE_integer = _defines.DEFINE_integer
+DEFINE_enum = _defines.DEFINE_enum
+DEFINE_list = _defines.DEFINE_list
+DEFINE_spaceseplist = _defines.DEFINE_spaceseplist
+DEFINE_multi = _defines.DEFINE_multi
+DEFINE_multi_string = _defines.DEFINE_multi_string
+DEFINE_multi_integer = _defines.DEFINE_multi_integer
+DEFINE_multi_float = _defines.DEFINE_multi_float
+DEFINE_multi_enum = _defines.DEFINE_multi_enum
+DEFINE_alias = _defines.DEFINE_alias
+# pylint: enable=invalid-name
+
+
+# Flag validators.
+register_validator = _validators.register_validator
+validator = _validators.validator
+register_multi_flags_validator = _validators.register_multi_flags_validator
+multi_flags_validator = _validators.multi_flags_validator
+mark_flag_as_required = _validators.mark_flag_as_required
+mark_flags_as_required = _validators.mark_flags_as_required
+mark_flags_as_mutual_exclusive = _validators.mark_flags_as_mutual_exclusive
+
+
+# Key flag related functions.
+declare_key_flag = _defines.declare_key_flag
+adopt_module_key_flags = _defines.adopt_module_key_flags
+disclaim_key_flags = _defines.disclaim_key_flags
+
+
+# Module exceptions.
+# pylint: disable=invalid-name
+Error = _exceptions.Error
+CantOpenFlagFileError = _exceptions.CantOpenFlagFileError
+DuplicateFlagError = _exceptions.DuplicateFlagError
+IllegalFlagValueError = _exceptions.IllegalFlagValueError
+UnrecognizedFlagError = _exceptions.UnrecognizedFlagError
+UnparsedFlagAccessError = _exceptions.UnparsedFlagAccessError
+ValidationError = _exceptions.ValidationError
+FlagNameConflictsWithMethodError = _exceptions.FlagNameConflictsWithMethodError
+
+
+# Public classes.
+Flag = _flag.Flag
+BooleanFlag = _flag.BooleanFlag
+EnumFlag = _flag.EnumFlag
+MultiFlag = _flag.MultiFlag
+FlagValues = _flagvalues.FlagValues
+ArgumentParser = _argument_parser.ArgumentParser
+BooleanParser = _argument_parser.BooleanParser
+EnumParser = _argument_parser.EnumParser
+ArgumentSerializer = _argument_parser.ArgumentSerializer
+FloatParser = _argument_parser.FloatParser
+IntegerParser = _argument_parser.IntegerParser
+BaseListParser = _argument_parser.BaseListParser
+ListParser = _argument_parser.ListParser
+ListSerializer = _argument_parser.ListSerializer
+CsvListSerializer = _argument_parser.CsvListSerializer
+WhitespaceSeparatedListParser = _argument_parser.WhitespaceSeparatedListParser
+# pylint: enable=invalid-name
+
+
+# Helper functions.
+get_help_width = _helpers.get_help_width
+text_wrap = _helpers.text_wrap
+flag_dict_to_args = _helpers.flag_dict_to_args
+doc_to_help = _helpers.doc_to_help
+
+
+# Special flags.
+_helpers.SPECIAL_FLAGS = FlagValues()
+
+DEFINE_string(
+    'flagfile', '',
+    'Insert flag definitions from the given file into the command line.',
+    _helpers.SPECIAL_FLAGS)
+
+DEFINE_string(
+    'undefok', '',
+    'comma-separated list of flag names that it is okay to specify '
+    'on the command line even if the program does not define a flag '
+    'with that name.  IMPORTANT: flags in this list that have '
+    'arguments MUST use the --flag=value format.', _helpers.SPECIAL_FLAGS)
+
+# The global FlagValues instance.
+FLAGS = _flagvalues.FLAGS