Move LayoutObject::m_previousPosition... into a global map in ObjectPaintInvalidator

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

 // Copyright 2016 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 ObjectPaintInvalidator_h
 #define ObjectPaintInvalidator_h
 
 #include "core/CoreExport.h"
 #include "platform/graphics/PaintInvalidationReason.h"
 #include "wtf/Allocator.h"
 #include "wtf/AutoReset.h"
 
 namespace blink {
 
 class DisplayItemClient;
 class LayoutBoxModelObject;
 class LayoutObject;
+class LayoutPoint;
 class LayoutRect;
 struct PaintInvalidatorContext;
 
 class CORE_EXPORT ObjectPaintInvalidator {
   STACK_ALLOCATED();
 
  public:
   ObjectPaintInvalidator(const LayoutObject& object) : m_object(object) {}
 
   static void objectWillBeDestroyed(const LayoutObject&);
@@ skipping 38 matching lines @@
   // rect is in the object's coordinate space.  If a DisplayItemClient is
   // specified, that client is invalidated rather than |m_object|.
   // Returns the visual rect that was invalidated (i.e, invalidation in the
   // space of the GraphicsLayer backing this LayoutObject).
   LayoutRect invalidatePaintRectangle(const LayoutRect&, DisplayItemClient*);
 
   void invalidatePaintIncludingNonCompositingDescendants();
   void invalidatePaintIncludingNonSelfPaintingLayerDescendants(
       const LayoutBoxModelObject& paintInvalidationContainer);
 
+  LayoutPoint previousLocationInBacking() const;
+  void setPreviousLocationInBacking(const LayoutPoint&);
+
  private:
   void invalidatePaintIncludingNonSelfPaintingLayerDescendantsInternal(
       const LayoutBoxModelObject& paintInvalidationContainer);
   void setBackingNeedsPaintInvalidationInRect(
       const LayoutBoxModelObject& paintInvalidationContainer,
       const LayoutRect&,
       PaintInvalidationReason);
 
  protected:
   const LayoutObject& m_object;
@@ skipping 47 matching lines @@
  public:
   DisablePaintInvalidationStateAsserts();
 
  private:
   AutoReset<bool> m_disabler;
 };
 
 }  // namespace blink
 
 #endif