[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/bindings/core/v8/V8SnapshotCreator.h

Index: third_party/WebKit/Source/bindings/core/v8/V8SnapshotCreator.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8SnapshotCreator.h b/third_party/WebKit/Source/bindings/core/v8/V8SnapshotCreator.h
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index 0000000000000000000000000000000000000000..dc180892259fb7a55076e57181ef8511abb9fd16
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+++ b/third_party/WebKit/Source/bindings/core/v8/V8SnapshotCreator.h
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+// 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 V8SnapshotCreator_h
+#define V8SnapshotCreator_h
+
+#include <v8.h>
+#include <cstdint>
+#include "bindings/core/v8/V8Binding.h"
+#include "core/CoreExport.h"
+
+namespace blink {
+
+class CORE_EXPORT V8SnapshotCreator {
+ public:
+  enum FieldType {
+    kNone,
+    kNodeType,
+    kDocumentType,
+    kHTMLDocumentType,
+    kHTMLDocumentObject,
+  };
+
+  static void TakeSnapshot(v8::SnapshotCreator*, int worldId);
+  static v8::StartupData SetUpSnapshotCreator(v8::SnapshotCreator*);
+  static v8::SnapshotCreator* GetSnapshotCreator();
+  static v8::StartupData Serialize(v8::Local<v8::Object>, int index, void*);
+
+  // In creating V8 context snapshot or not
+  static bool TakingSnapshot();
+  static void SetTakingSnapshot(bool);
+};
+
+}  // namespace blink
+
+#endif  // V8SnapshotCreator_h