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diff --git a/third_party/protobuf/3.6.0/src/google/protobuf/implicit_weak_message.h b/third_party/protobuf/3.6.0/src/google/protobuf/implicit_weak_message.h
new file mode 100644
index 0000000000..3279bd1777
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+++ b/third_party/protobuf/3.6.0/src/google/protobuf/implicit_weak_message.h
@@ -0,0 +1,135 @@
+// 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_IMPLICIT_WEAK_MESSAGE_H__
+#define GOOGLE_PROTOBUF_IMPLICIT_WEAK_MESSAGE_H__
+
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/arena.h>
+#include <google/protobuf/message_lite.h>
+
+// This file is logically internal-only and should only be used by protobuf
+// generated code.
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+// An implementation of MessageLite that treats all data as unknown. This type
+// acts as a placeholder for an implicit weak field in the case where the true
+// message type does not get linked into the binary.
+class LIBPROTOBUF_EXPORT ImplicitWeakMessage : public MessageLite {
+ public:
+  ImplicitWeakMessage() : arena_(NULL) {}
+  explicit ImplicitWeakMessage(Arena* arena) : arena_(arena) {}
+
+  static const ImplicitWeakMessage* default_instance();
+
+  string GetTypeName() const { return ""; }
+
+  MessageLite* New() const { return new ImplicitWeakMessage; }
+  MessageLite* New(Arena* arena) const {
+    return Arena::CreateMessage<ImplicitWeakMessage>(arena);
+  }
+
+  Arena* GetArena() const { return arena_; }
+
+  void Clear() { data_.clear(); }
+
+  bool IsInitialized() const { return true; }
+
+  void CheckTypeAndMergeFrom(const MessageLite& other) {
+    data_.append(static_cast<const ImplicitWeakMessage&>(other).data_);
+  }
+
+  bool MergePartialFromCodedStream(io::CodedInputStream* input);
+
+  size_t ByteSizeLong() const { return data_.size(); }
+
+  void SerializeWithCachedSizes(io::CodedOutputStream* output) const {
+    output->WriteString(data_);
+  }
+
+  int GetCachedSize() const { return static_cast<int>(data_.size()); }
+
+  typedef void InternalArenaConstructable_;
+
+ private:
+  Arena* const arena_;
+  string data_;
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ImplicitWeakMessage);
+};
+
+// A type handler for use with implicit weak repeated message fields.
+template <typename ImplicitWeakType>
+class ImplicitWeakTypeHandler {
+ public:
+  typedef ImplicitWeakType Type;
+  typedef ::google::protobuf::MessageLite WeakType;
+  static const bool Moveable = false;
+
+  // With implicit weak fields, we need separate NewFromPrototype and
+  // NewFromPrototypeWeak functions. The former is used when we want to create a
+  // strong dependency on the message type, and it just delegates to the
+  // GenericTypeHandler. The latter avoids creating a strong dependency, by
+  // simply calling MessageLite::New.
+  static inline ::google::protobuf::MessageLite* NewFromPrototype(
+      const ::google::protobuf::MessageLite* prototype, ::google::protobuf::Arena* arena = NULL) {
+    return prototype->New(arena);
+  }
+
+  static inline void Delete(::google::protobuf::MessageLite* value, Arena* arena) {
+    if (arena == NULL) {
+      delete value;
+    }
+  }
+  static inline ::google::protobuf::Arena* GetArena(::google::protobuf::MessageLite* value) {
+    return value->GetArena();
+  }
+  static inline void* GetMaybeArenaPointer(::google::protobuf::MessageLite* value) {
+    return value->GetArena();
+  }
+  static inline void Clear(::google::protobuf::MessageLite* value) {
+    value->Clear();
+  }
+  static void Merge(const ::google::protobuf::MessageLite& from,
+                    ::google::protobuf::MessageLite* to) {
+    to->CheckTypeAndMergeFrom(from);
+  }
+  static inline size_t SpaceUsedLong(const Type& value) {
+    return value.SpaceUsedLong();
+  }
+};
+
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_IMPLICIT_WEAK_MESSAGE_H__