[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/bindings/modules/v8/V8SnapshotReference.h

Index: third_party/WebKit/Source/bindings/modules/v8/V8SnapshotReference.h
diff --git a/third_party/WebKit/Source/bindings/modules/v8/V8SnapshotReference.h b/third_party/WebKit/Source/bindings/modules/v8/V8SnapshotReference.h
new file mode 100644
index 0000000000000000000000000000000000000000..fadf22a2bc4422a33d90b4229ced7acc807f881a
--- /dev/null
+++ b/third_party/WebKit/Source/bindings/modules/v8/V8SnapshotReference.h
@@ -0,0 +1,21 @@
+// 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 V8SnapshotReference_h
+#define V8SnapshotReference_h
+
+#include <v8.h>
+#include <cstdint>
+#include "modules/ModulesExport.h"
+
+namespace blink {
+
+class MODULES_EXPORT V8SnapshotReference {
+ public:
+  static intptr_t* getExternalReferences();
+};
+
+}  // namespace blink
+
+#endif  // V8SnapshotReference_h