Add DataPersistent<> for copy-on-modify and use for StyleFilterData.

third_party/WebKit/Source/core/style/StyleRareNonInheritedData.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 13 matching lines @@
 
 #ifndef StyleRareNonInheritedData_h
 #define StyleRareNonInheritedData_h
 
 #include "core/CoreExport.h"
 #include "core/css/StyleColor.h"
 #include "core/layout/ClipPathOperation.h"
 #include "core/style/BasicShapes.h"
 #include "core/style/CounterDirectives.h"
 #include "core/style/CursorData.h"
+#include "core/style/DataPersistent.h"
 #include "core/style/DataRef.h"
 #include "core/style/FillLayer.h"
 #include "core/style/ComputedStyleConstants.h"
 #include "core/style/LineClampValue.h"
 #include "core/style/NinePieceImage.h"
 #include "core/style/ShapeValue.h"
 #include "core/style/StyleContentAlignmentData.h"
 #include "core/style/StyleScrollSnapData.h"
 #include "core/style/StyleSelfAlignmentData.h"
 #include "platform/LengthPoint.h"
@@ skipping 65 matching lines @@
 
     LineClampValue lineClamp; // An Apple extension.
     DraggableRegionMode m_draggableRegionMode;
 
     DataRef<StyleDeprecatedFlexibleBoxData> m_deprecatedFlexibleBox; // Flexible box properties
     DataRef<StyleFlexibleBoxData> m_flexibleBox;
     DataRef<StyleMultiColData> m_multiCol; //  CSS3 multicol properties
     DataRef<StyleTransformData> m_transform; // Transform properties (rotate, scale, skew, etc.)
     DataRef<StyleWillChangeData> m_willChange; // CSS Will Change
 
-    DataRef<StyleFilterData> m_filter; // Filter operations (url, sepia, blur, etc.)
-    DataRef<StyleFilterData> m_backdropFilter; // Backdrop filter operations (url, sepia, blur, etc.)
+    DataPersistent<StyleFilterData> m_filter; // Filter operations (url, sepia, blur, etc.)
+    DataPersistent<StyleFilterData> m_backdropFilter; // Backdrop filter operations (url, sepia, blur, etc.)
 
     DataRef<StyleGridData> m_grid;
     DataRef<StyleGridItemData> m_gridItem;
     DataRef<StyleScrollSnapData> m_scrollSnap;
 
     Persistent<ContentData> m_content;
     OwnPtr<CounterDirectiveMap> m_counterDirectives;
     OwnPtr<CSSAnimationData> m_animations;
     OwnPtr<CSSTransitionData> m_transitions;
 
@@ skipping 83 matching lines @@
     unsigned m_hasAuthorBorder : 1; // Whether there is a author-defined border.
 
 private:
     StyleRareNonInheritedData();
     StyleRareNonInheritedData(const StyleRareNonInheritedData&);
 };
 
 } // namespace blink
 
 #endif // StyleRareNonInheritedData_h