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diff --git a/third_party/protobuf/3.4.0/src/google/protobuf/map_test_util.h b/third_party/protobuf/3.4.0/src/google/protobuf/map_test_util.h
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@@ -0,0 +1,166 @@
+// 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.
+
+#ifndef GOOGLE_PROTOBUF_MAP_TEST_UTIL_H__
+#define GOOGLE_PROTOBUF_MAP_TEST_UTIL_H__
+
+#include <google/protobuf/map_unittest.pb.h>
+
+namespace google {
+namespace protobuf {
+
+namespace unittest = ::protobuf_unittest;
+
+class MapTestUtil {
+ public:
+  // Set every field in the TestMap message to a unique value.
+  static void SetMapFields(unittest::TestMap* message);
+
+  // Set every field in the TestArenaMap message to a unique value.
+  static void SetArenaMapFields(unittest::TestArenaMap* message);
+
+  // Set every field in the message to a default value.
+  static void SetMapFieldsInitialized(unittest::TestMap* message);
+
+  // Modify all the map fields of the message (which should already have been
+  // initialized with SetMapFields()).
+  static void ModifyMapFields(unittest::TestMap* message);
+
+  // Check that all fields have the values that they should have after
+  // SetMapFields() is called.
+  static void ExpectMapFieldsSet(const unittest::TestMap& message);
+
+  // Check that all fields have the values that they should have after
+  // SetMapFields() is called for TestArenaMap.
+  static void ExpectArenaMapFieldsSet(const unittest::TestArenaMap& message);
+
+  // Check that all fields have the values that they should have after
+  // SetMapFieldsInitialized() is called.
+  static void ExpectMapFieldsSetInitialized(
+      const unittest::TestMap& message);
+
+  // Expect that the message is modified as would be expected from
+  // ModifyMapFields().
+  static void ExpectMapFieldsModified(const unittest::TestMap& message);
+
+  // Check that all fields are empty.
+  static void ExpectClear(const unittest::TestMap& message);
+
+  // Check that all map fields have the given size.
+  static void ExpectMapsSize(const unittest::TestMap& message, int size);
+
+  // Get pointers of map entries at given index.
+  static std::vector<const Message*> GetMapEntries(
+      const unittest::TestMap& message, int index);
+
+  // Get pointers of map entries from release.
+  static std::vector<const Message*> GetMapEntriesFromRelease(
+      unittest::TestMap* message);
+};
+
+// Like above, but use the reflection interface.
+class MapReflectionTester {
+ public:
+  // base_descriptor must be a descriptor for TestMap, which is used for
+  // MapReflectionTester to fetch the FieldDescriptors needed to use the
+  // reflection interface.
+  explicit MapReflectionTester(const Descriptor* base_descriptor);
+
+  void SetMapFieldsViaReflection(Message* message);
+  void SetMapFieldsViaMapReflection(Message* message);
+  void ClearMapFieldsViaReflection(Message* message);
+  void ModifyMapFieldsViaReflection(Message* message);
+  void RemoveLastMapsViaReflection(Message* message);
+  void ReleaseLastMapsViaReflection(Message* message);
+  void SwapMapsViaReflection(Message* message);
+  void MutableUnknownFieldsOfMapFieldsViaReflection(Message* message);
+  void ExpectMapFieldsSetViaReflection(const Message& message);
+  void ExpectMapFieldsSetViaReflectionIterator(Message* message);
+  void ExpectClearViaReflection(const Message& message);
+  void ExpectClearViaReflectionIterator(Message* message);
+  void ExpectMapEntryClearViaReflection(Message* message);
+  void GetMapValueViaMapReflection(Message* message,
+                                   const string& field_name,
+                                   const MapKey& map_key, MapValueRef* map_val);
+  Message* GetMapEntryViaReflection(Message* message, const string& field_name,
+                                    int index);
+  MapIterator MapBegin(Message* message, const string& field_name);
+  MapIterator MapEnd(Message* message, const string& field_name);
+
+ private:
+  const FieldDescriptor* F(const string& name);
+
+  const Descriptor* base_descriptor_;
+
+  const EnumValueDescriptor* map_enum_bar_;
+  const EnumValueDescriptor* map_enum_baz_;
+  const EnumValueDescriptor* map_enum_foo_;
+
+  const FieldDescriptor* foreign_c_;
+  const FieldDescriptor* map_int32_int32_key_;
+  const FieldDescriptor* map_int32_int32_val_;
+  const FieldDescriptor* map_int64_int64_key_;
+  const FieldDescriptor* map_int64_int64_val_;
+  const FieldDescriptor* map_uint32_uint32_key_;
+  const FieldDescriptor* map_uint32_uint32_val_;
+  const FieldDescriptor* map_uint64_uint64_key_;
+  const FieldDescriptor* map_uint64_uint64_val_;
+  const FieldDescriptor* map_sint32_sint32_key_;
+  const FieldDescriptor* map_sint32_sint32_val_;
+  const FieldDescriptor* map_sint64_sint64_key_;
+  const FieldDescriptor* map_sint64_sint64_val_;
+  const FieldDescriptor* map_fixed32_fixed32_key_;
+  const FieldDescriptor* map_fixed32_fixed32_val_;
+  const FieldDescriptor* map_fixed64_fixed64_key_;
+  const FieldDescriptor* map_fixed64_fixed64_val_;
+  const FieldDescriptor* map_sfixed32_sfixed32_key_;
+  const FieldDescriptor* map_sfixed32_sfixed32_val_;
+  const FieldDescriptor* map_sfixed64_sfixed64_key_;
+  const FieldDescriptor* map_sfixed64_sfixed64_val_;
+  const FieldDescriptor* map_int32_float_key_;
+  const FieldDescriptor* map_int32_float_val_;
+  const FieldDescriptor* map_int32_double_key_;
+  const FieldDescriptor* map_int32_double_val_;
+  const FieldDescriptor* map_bool_bool_key_;
+  const FieldDescriptor* map_bool_bool_val_;
+  const FieldDescriptor* map_string_string_key_;
+  const FieldDescriptor* map_string_string_val_;
+  const FieldDescriptor* map_int32_bytes_key_;
+  const FieldDescriptor* map_int32_bytes_val_;
+  const FieldDescriptor* map_int32_enum_key_;
+  const FieldDescriptor* map_int32_enum_val_;
+  const FieldDescriptor* map_int32_foreign_message_key_;
+  const FieldDescriptor* map_int32_foreign_message_val_;
+};
+
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_MAP_TEST_UTIL_H__