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diff --git a/third_party/protobuf/3.4.0/conformance/conformance_python.py b/third_party/protobuf/3.4.0/conformance/conformance_python.py
new file mode 100755
index 0000000000..c5ba2467a6
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+++ b/third_party/protobuf/3.4.0/conformance/conformance_python.py
@@ -0,0 +1,146 @@
+#!/usr/bin/env python
+#
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# 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.
+
+"""A conformance test implementation for the Python protobuf library.
+
+See conformance.proto for more information.
+"""
+
+import struct
+import sys
+import os
+from google.protobuf import descriptor
+from google.protobuf import descriptor_pool
+from google.protobuf import json_format
+from google.protobuf import message
+from google.protobuf import test_messages_proto3_pb2
+from google.protobuf import test_messages_proto2_pb2
+import conformance_pb2
+
+sys.stdout = os.fdopen(sys.stdout.fileno(), 'wb', 0)
+sys.stdin = os.fdopen(sys.stdin.fileno(), 'rb', 0)
+
+test_count = 0
+verbose = False
+
+class ProtocolError(Exception):
+  pass
+
+def do_test(request):
+  isProto3 = (request.message_type == "protobuf_test_messages.proto3.TestAllTypesProto3")
+  isJson = (request.WhichOneof('payload') == 'json_payload')
+  isProto2 = (request.message_type == "protobuf_test_messages.proto2.TestAllTypesProto2")
+  
+  if (not isProto3) and (not isJson) and (not isProto2):
+    raise ProtocolError("Protobuf request doesn't have specific payload type")
+      
+  test_message = test_messages_proto2_pb2.TestAllTypesProto2() if isProto2 else \
+    test_messages_proto3_pb2.TestAllTypesProto3()
+
+  response = conformance_pb2.ConformanceResponse()
+
+  try:
+    if request.WhichOneof('payload') == 'protobuf_payload':
+      try:
+        test_message.ParseFromString(request.protobuf_payload)
+      except message.DecodeError as e:
+        response.parse_error = str(e)
+        return response  
+      
+    elif request.WhichOneof('payload') == 'json_payload':
+      try:
+        json_format.Parse(request.json_payload, test_message)
+      except Exception as e:
+        response.parse_error = str(e)
+        return response
+
+    else:
+      raise ProtocolError("Request didn't have payload.")
+
+    if request.requested_output_format == conformance_pb2.UNSPECIFIED:
+      raise ProtocolError("Unspecified output format")
+
+    elif request.requested_output_format == conformance_pb2.PROTOBUF:
+      response.protobuf_payload = test_message.SerializeToString()
+
+    elif request.requested_output_format == conformance_pb2.JSON:
+      try: 
+        response.json_payload = json_format.MessageToJson(test_message)
+      except Exception as e:
+        response.serialize_error = str(e)
+        return response
+
+  except Exception as e:
+    response.runtime_error = str(e)
+
+  return response
+
+def do_test_io():
+  length_bytes = sys.stdin.read(4)
+  if len(length_bytes) == 0:
+    return False   # EOF
+  elif len(length_bytes) != 4:
+    raise IOError("I/O error")
+
+  # "I" is "unsigned int", so this depends on running on a platform with
+  # 32-bit "unsigned int" type.  The Python struct module unfortunately
+  # has no format specifier for uint32_t.
+  length = struct.unpack("<I", length_bytes)[0]
+  serialized_request = sys.stdin.read(length)
+  if len(serialized_request) != length:
+    raise IOError("I/O error")
+
+  request = conformance_pb2.ConformanceRequest()
+  request.ParseFromString(serialized_request)
+
+  response = do_test(request)
+
+  serialized_response = response.SerializeToString()
+  sys.stdout.write(struct.pack("<I", len(serialized_response)))
+  sys.stdout.write(serialized_response)
+  sys.stdout.flush()
+
+  if verbose:
+    sys.stderr.write("conformance_python: request=%s, response=%s\n" % (
+                       request.ShortDebugString().c_str(),
+                       response.ShortDebugString().c_str()))
+
+  global test_count
+  test_count += 1
+
+  return True
+
+while True:
+  if not do_test_io():
+    sys.stderr.write("conformance_python: received EOF from test runner " +
+                     "after %s tests, exiting\n" % (test_count))
+    sys.exit(0)