Make compositing updates 30.7% faster for calculator

Source/core/rendering/compositing/CompositingPropertyUpdater.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 CompositingPropertyUpdater_h
+#define CompositingPropertyUpdater_h
+
+#include "core/rendering/RenderGeometryMap.h"
+
+namespace WebCore {
+
+class RenderLayer;
+
+class CompositingPropertyUpdater {
+public:
+    CompositingPropertyUpdater();
+    ~CompositingPropertyUpdater();
+
+    enum UpdateType {
+        DoNotForceUpdate,
+        ForceUpdate,
+    };
+
+    void updateAncestorDependentProperties(RenderLayer*, UpdateType = DoNotForceUpdate);
+
+#if !ASSERT_DISABLED
+    static void assertNeedsToUpdateAncestorDependantPropertiesBitsCleared(RenderLayer*);
+#endif
+
+private:
+    RenderGeometryMap m_geometryMap;
+};
+
+} // namespace WebCore
+
+#endif // CompositingPropertyUpdater_h