[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
new file mode 100644
index 0000000000000000000000000000000000000000..03623b5f34c7f57beea3ff6bd09294c51ecac861
--- /dev/null
+++ b/third_party/WebKit/public/web/WebV8ContextSnapshot.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 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.

[haraken, 2017/07/10 06:52:09]

Add:

// This API should be used only by tools/v8_context_snapshot, which runs during
Chromium's build step.

[peria, 2017/07/10 10:18:44]

Done.

+class BLINK_EXPORT WebV8ContextSnapshot {
+ public:
+  static v8::StartupData TakeSnapshot();
+};
+
+}  // namespace blink
+
+#endif  // WebV8ContextSnapshot_h