[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/bindings/modules/v8/V8ContextSnapshotExternalReferences.h

Index: third_party/WebKit/Source/bindings/modules/v8/V8ContextSnapshotExternalReferences.h
diff --git a/third_party/WebKit/Source/bindings/modules/v8/V8ContextSnapshotExternalReferences.h b/third_party/WebKit/Source/bindings/modules/v8/V8ContextSnapshotExternalReferences.h
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index 0000000000000000000000000000000000000000..3c7645eb4e1b8f1e38554250e5e7f42ba177e662
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+++ b/third_party/WebKit/Source/bindings/modules/v8/V8ContextSnapshotExternalReferences.h
@@ -0,0 +1,29 @@
+// 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 V8ContextSnapshotExternalReferences_h
+#define V8ContextSnapshotExternalReferences_h
+
+#include <cstdint>
+
+#include "modules/ModulesExport.h"
+#include "platform/wtf/Allocator.h"
+
+namespace blink {
+
+// V8ContextSnapshotExternalReferences::GetTable() provides a table of pointers
+// of C++ callbacks exposed to V8. The table contains C++ callbacks for DOM
+// attribute getters, setters, DOM methods, wrapper type info etc.
+class MODULES_EXPORT V8ContextSnapshotExternalReferences {
+  STATIC_ONLY(V8ContextSnapshotExternalReferences);
+
+ public:
+  // The definition of this method is auto-generated in
+  // V8ContextSnapshotExternalReferences.cpp.
+  static intptr_t* GetTable();
+};
+
+}  // namespace blink
+
+#endif  // V8ContextSnapshotExternalReferences_h