Refactor to centralize code which decides whether ObjectPaintProperties are needed.

third_party/WebKit/Source/core/paint/RarePaintData.h

 // 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 RarePaintData_h
 #define RarePaintData_h
 
 #include "core/CoreExport.h"
 #include "platform/wtf/Allocator.h"
 #include "platform/wtf/Noncopyable.h"
@@ skipping 14 matching lines @@
   RarePaintData();
   ~RarePaintData();
 
   PaintLayer* Layer() { return layer_.get(); }
   void SetLayer(std::unique_ptr<PaintLayer>);
 
   ObjectPaintProperties* PaintProperties() const {
     return paint_properties_.get();
   }
   ObjectPaintProperties& EnsurePaintProperties();
+  void ClearPaintProperties();
 
   PropertyTreeState* LocalBorderBoxProperties() const {
     return local_border_box_properties_.get();
   }
 
   void ClearLocalBorderBoxProperties();
   void SetLocalBorderBoxProperties(PropertyTreeState&);
 
   // This is the complete set of property nodes that can be used to paint the
   // contents of this object. It is similar to local_border_box_properties_ but
@@ skipping 18 matching lines @@
   //   The div's local border box properties would have an opacity 0.3 effect
   //   node. Even though the div has no transform, its local border box
   //   properties would have a transform node that points to the div's
   //   ancestor transform space.
   std::unique_ptr<PropertyTreeState> local_border_box_properties_;
 };
 
 }  // namespace blink
 
 #endif