[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/bindings/modules/v8/V8SnapshotExternalReferences.h

+// Copyright 2017 The Chromium 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 V8SnapshotExternalReferences_h
+#define V8SnapshotExternalReferences_h
+
+#include <cstdint>
+
+#include "modules/ModulesExport.h"
+#include "platform/wtf/Allocator.h"
+
+namespace blink {
+
+class MODULES_EXPORT V8SnapshotExternalReferences {
+  STATIC_ONLY(V8SnapshotExternalReferences);
+
+ public:
+  // The definition of this method is in a generated code
+  // V8SnapshotExternalReferences.cpp.
+  static intptr_t* GetTable();
+};
+
+}  // namespace blink
+
+#endif  // V8SnapshotExternalReferences_h