[Bindings] Create and use V8 context snapshots

third_party/WebKit/public/web/WebV8ContextSnapshot.h

Index: third_party/WebKit/public/web/WebV8ContextSnapshot.h
diff --git a/third_party/WebKit/public/web/WebV8ContextSnapshot.h b/third_party/WebKit/public/web/WebV8ContextSnapshot.h
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index 0000000000000000000000000000000000000000..336bedb66310f23e1bb480811c46b0567d4bbc1b
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+++ b/third_party/WebKit/public/web/WebV8ContextSnapshot.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 WebV8ContextSnapshot_h
+#define WebV8ContextSnapshot_h
+
+#include "public/platform/WebCommon.h"
+#include "v8/include/v8.h"
+
+namespace blink {
+
+// WebV8ContextSnapshot is an API to take a snapshot of V8 context.
+// This API should be used only by tools/v8_context_snapshot, which runs during
+// Chromium's build step.
+class BLINK_EXPORT WebV8ContextSnapshot {
+ public:
+  static v8::StartupData TakeSnapshot();
+};
+
+}  // namespace blink
+
+#endif  // WebV8ContextSnapshot_h