Devtools: Create layout editor experiment

Source/core/inspector/LayoutEditor.h

Index: Source/core/inspector/LayoutEditor.h
diff --git a/Source/core/inspector/LayoutEditor.h b/Source/core/inspector/LayoutEditor.h
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index 0000000000000000000000000000000000000000..a0ed0a6339271183fa7e1d32236cb198ac287cfd
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+++ b/Source/core/inspector/LayoutEditor.h
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+// Copyright 2015 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 LayoutEditor_h
+#define LayoutEditor_h
+
+#include "wtf/PassOwnPtr.h"
+#include "wtf/RefPtr.h"
+
+namespace blink {
+
+class JSONObject;
+class Node;
+
+class LayoutEditor final {
+public:
+    static PassOwnPtr<LayoutEditor> create(Node* node)
+    {
+        return adoptPtr(new LayoutEditor(node));
+    }
+    PassRefPtr<JSONObject> buildJSONInfo() const;
+
+private:
+    explicit LayoutEditor(Node*);
+
+    RefPtr<Node> m_node;
+};
+
+} // namespace blink
+
+
+#endif // !defined(LayoutEditor_h)