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diff --git a/deps/v8/src/value-serializer.h b/deps/v8/src/value-serializer.h
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+++ b/deps/v8/src/value-serializer.h
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+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_VALUE_SERIALIZER_H_
+#define V8_VALUE_SERIALIZER_H_
+
+#include <cstdint>
+#include <vector>
+
+#include "include/v8.h"
+#include "src/base/compiler-specific.h"
+#include "src/base/macros.h"
+#include "src/identity-map.h"
+#include "src/vector.h"
+#include "src/zone.h"
+
+namespace v8 {
+namespace internal {
+
+class HeapNumber;
+class Isolate;
+class JSDate;
+class JSRegExp;
+class JSValue;
+class Object;
+class Oddball;
+class Smi;
+
+enum class SerializationTag : uint8_t;
+
+/**
+ * Writes V8 objects in a binary format that allows the objects to be cloned
+ * according to the HTML structured clone algorithm.
+ *
+ * Format is based on Blink's previous serialization logic.
+ */
+class ValueSerializer {
+ public:
+  explicit ValueSerializer(Isolate* isolate);
+  ~ValueSerializer();
+
+  /*
+   * Writes out a header, which includes the format version.
+   */
+  void WriteHeader();
+
+  /*
+   * Serializes a V8 object into the buffer.
+   */
+  Maybe<bool> WriteObject(Handle<Object> object) WARN_UNUSED_RESULT;
+
+  /*
+   * Returns the stored data. This serializer should not be used once the buffer
+   * is released. The contents are undefined if a previous write has failed.
+   */
+  std::vector<uint8_t> ReleaseBuffer() { return std::move(buffer_); }
+
+ private:
+  // Writing the wire format.
+  void WriteTag(SerializationTag tag);
+  template <typename T>
+  void WriteVarint(T value);
+  template <typename T>
+  void WriteZigZag(T value);
+  void WriteDouble(double value);
+  void WriteOneByteString(Vector<const uint8_t> chars);
+  void WriteTwoByteString(Vector<const uc16> chars);
+  uint8_t* ReserveRawBytes(size_t bytes);
+
+  // Writing V8 objects of various kinds.
+  void WriteOddball(Oddball* oddball);
+  void WriteSmi(Smi* smi);
+  void WriteHeapNumber(HeapNumber* number);
+  void WriteString(Handle<String> string);
+  Maybe<bool> WriteJSReceiver(Handle<JSReceiver> receiver) WARN_UNUSED_RESULT;
+  Maybe<bool> WriteJSObject(Handle<JSObject> object) WARN_UNUSED_RESULT;
+  Maybe<bool> WriteJSArray(Handle<JSArray> array) WARN_UNUSED_RESULT;
+  void WriteJSDate(JSDate* date);
+  Maybe<bool> WriteJSValue(Handle<JSValue> value) WARN_UNUSED_RESULT;
+  void WriteJSRegExp(JSRegExp* regexp);
+
+  /*
+   * Reads the specified keys from the object and writes key-value pairs to the
+   * buffer. Returns the number of keys actually written, which may be smaller
+   * if some keys are not own properties when accessed.
+   */
+  Maybe<uint32_t> WriteJSObjectProperties(
+      Handle<JSObject> object, Handle<FixedArray> keys) WARN_UNUSED_RESULT;
+
+  Isolate* const isolate_;
+  std::vector<uint8_t> buffer_;
+  Zone zone_;
+
+  // To avoid extra lookups in the identity map, ID+1 is actually stored in the
+  // map (checking if the used identity is zero is the fast way of checking if
+  // the entry is new).
+  IdentityMap<uint32_t> id_map_;
+  uint32_t next_id_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(ValueSerializer);
+};
+
+/*
+ * Deserializes values from data written with ValueSerializer, or a compatible
+ * implementation.
+ */
+class ValueDeserializer {
+ public:
+  ValueDeserializer(Isolate* isolate, Vector<const uint8_t> data);
+  ~ValueDeserializer();
+
+  /*
+   * Runs version detection logic, which may fail if the format is invalid.
+   */
+  Maybe<bool> ReadHeader() WARN_UNUSED_RESULT;
+
+  /*
+   * Deserializes a V8 object from the buffer.
+   */
+  MaybeHandle<Object> ReadObject() WARN_UNUSED_RESULT;
+
+  /*
+   * Reads an object, consuming the entire buffer.
+   *
+   * This is required for the legacy "version 0" format, which did not allow
+   * reference deduplication, and instead relied on a "stack" model for
+   * deserializing, with the contents of objects and arrays provided first.
+   */
+  MaybeHandle<Object> ReadObjectUsingEntireBufferForLegacyFormat()
+      WARN_UNUSED_RESULT;
+
+ private:
+  // Reading the wire format.
+  Maybe<SerializationTag> PeekTag() const WARN_UNUSED_RESULT;
+  void ConsumeTag(SerializationTag peeked_tag);
+  Maybe<SerializationTag> ReadTag() WARN_UNUSED_RESULT;
+  template <typename T>
+  Maybe<T> ReadVarint() WARN_UNUSED_RESULT;
+  template <typename T>
+  Maybe<T> ReadZigZag() WARN_UNUSED_RESULT;
+  Maybe<double> ReadDouble() WARN_UNUSED_RESULT;
+  Maybe<Vector<const uint8_t>> ReadRawBytes(int size) WARN_UNUSED_RESULT;
+
+  // Reading V8 objects of specific kinds.
+  // The tag is assumed to have already been read.
+  MaybeHandle<String> ReadUtf8String() WARN_UNUSED_RESULT;
+  MaybeHandle<String> ReadTwoByteString() WARN_UNUSED_RESULT;
+  MaybeHandle<JSObject> ReadJSObject() WARN_UNUSED_RESULT;
+  MaybeHandle<JSArray> ReadSparseJSArray() WARN_UNUSED_RESULT;
+  MaybeHandle<JSArray> ReadDenseJSArray() WARN_UNUSED_RESULT;
+  MaybeHandle<JSDate> ReadJSDate() WARN_UNUSED_RESULT;
+  MaybeHandle<JSValue> ReadJSValue(SerializationTag tag) WARN_UNUSED_RESULT;
+  MaybeHandle<JSRegExp> ReadJSRegExp() WARN_UNUSED_RESULT;
+
+  /*
+   * Reads key-value pairs into the object until the specified end tag is
+   * encountered. If successful, returns the number of properties read.
+   */
+  Maybe<uint32_t> ReadJSObjectProperties(Handle<JSObject> object,
+                                         SerializationTag end_tag);
+
+  // Manipulating the map from IDs to reified objects.
+  bool HasObjectWithID(uint32_t id);
+  MaybeHandle<JSReceiver> GetObjectWithID(uint32_t id);
+  void AddObjectWithID(uint32_t id, Handle<JSReceiver> object);
+
+  Isolate* const isolate_;
+  const uint8_t* position_;
+  const uint8_t* const end_;
+  uint32_t version_ = 0;
+  Handle<SeededNumberDictionary> id_map_;  // Always a global handle.
+  uint32_t next_id_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(ValueDeserializer);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_VALUE_SERIALIZER_H_