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

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

Index: third_party/WebKit/Source/core/paint/ObjectPaintInvalidator.h
diff --git a/third_party/WebKit/Source/core/paint/ObjectPaintInvalidator.h b/third_party/WebKit/Source/core/paint/ObjectPaintInvalidator.h
index 5b95d3bc43b1d20e1921b495235a6f1276ef643d..d98fb3bf0c921698e92479c73551db0d3955a9ef 100644
--- a/third_party/WebKit/Source/core/paint/ObjectPaintInvalidator.h
+++ b/third_party/WebKit/Source/core/paint/ObjectPaintInvalidator.h
@@ -15,6 +15,7 @@ namespace blink {
 class DisplayItemClient;
 class LayoutBoxModelObject;
 class LayoutObject;
+class LayoutPoint;
 class LayoutRect;
 struct PaintInvalidatorContext;
 
@@ -73,6 +74,9 @@ class CORE_EXPORT ObjectPaintInvalidator {
   void invalidatePaintIncludingNonSelfPaintingLayerDescendants(
       const LayoutBoxModelObject& paintInvalidationContainer);
 
+  LayoutPoint previousLocationInBacking() const;
+  void setPreviousLocationInBacking(const LayoutPoint&);
+
  private:
   void invalidatePaintIncludingNonSelfPaintingLayerDescendantsInternal(
       const LayoutBoxModelObject& paintInvalidationContainer);