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

third_party/WebKit/Source/core/layout/PaintInvalidationState.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 PaintInvalidationState_h
 #define PaintInvalidationState_h
 
 #include "core/CoreExport.h"
 #include "core/paint/PaintInvalidator.h"
 #include "platform/geometry/LayoutRect.h"
@@ skipping 71 matching lines @@
   }
   void setForceSubtreeInvalidationRectUpdateWithinContainer() {
     m_forcedSubtreeInvalidationFlags |=
         PaintInvalidatorContext::ForcedSubtreeInvalidationRectUpdate;
   }
 
   const LayoutBoxModelObject& paintInvalidationContainer() const {
     return *m_paintInvalidationContainer;
   }
 
-  // Computes the position of the current object ((0,0) in the space of the
+  // Computes the location of the current object ((0,0) in the space of the
   // object) in the space of paint invalidation backing.
-  LayoutPoint computePositionFromPaintInvalidationBacking() const;
+  LayoutPoint computeLocationInBacking(
+      const LayoutPoint& visualRectLocation) const;
 
   // Returns the rect bounds needed to invalidate paint of this object,
   // in the space of paint invalidation backing.
   LayoutRect computeVisualRectInBacking() const;
 
   void mapLocalRectToPaintInvalidationBacking(LayoutRect&) const;
 
   PaintLayer& paintingLayer() const;
 
   const LayoutObject& currentObject() const { return m_currentObject; }
@@ skipping 86 matching lines @@
   void mapLocalRectToPaintInvalidationBacking(const LayoutObject&,
                                               LayoutRect&) const override;
 
  private:
   const PaintInvalidationState& m_paintInvalidationState;
 };
 
 }  // namespace blink
 
 #endif  // PaintInvalidationState_h