Add layout states to DocumentLifecycle state machine

Source/core/frame/DeprecatedScheduleStyleRecalcDuringLayout.h

+// Copyright 2014 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 DeprecatedScheduleStyleRecalcDuringLayout_h
+#define DeprecatedScheduleStyleRecalcDuringLayout_h
+
+#include "core/dom/DocumentLifecycle.h"
+
+namespace WebCore {
+
+class DeprecatedScheduleStyleRecalcDuringLayout {
+    WTF_MAKE_NONCOPYABLE(DeprecatedScheduleStyleRecalcDuringLayout);
+public:
+    explicit DeprecatedScheduleStyleRecalcDuringLayout(DocumentLifecycle&);
+    ~DeprecatedScheduleStyleRecalcDuringLayout();
+
+private:
+    DocumentLifecycle& m_lifecycle;
+    DocumentLifecycle::DeprecatedTransition m_deprecatedTransition;
+    bool m_wasInPerformLayout;
+};
+
+}
+
+#endif