LayoutObject::invalidatePaintIfNeededForSynchronizedPainting() and plumbing

third_party/WebKit/Source/core/paint/LayoutObjectDrawingRecorder.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 LayoutObjectDrawingRecorder_h
 #define LayoutObjectDrawingRecorder_h
 
 #include "core/layout/LayoutObject.h"
 #include "core/paint/PaintPhase.h"
 #include "platform/geometry/LayoutPoint.h"
@@ skipping 54 matching lines @@
     static void updatePaintOffsetIfNeeded(DisplayItemList* displayItemList, const LayoutObject& layoutObject, const LayoutPoint& paintOffset)
     {
         if (!RuntimeEnabledFeatures::slimmingPaintOffsetCachingEnabled() || displayItemList->skippingCache())
             return;
 
         if (layoutObject.paintOffsetChanged(paintOffset))
             displayItemList->invalidatePaintOffset(layoutObject);
         else
             ASSERT(!displayItemList->paintOffsetWasInvalidated(layoutObject.displayItemClient()) || !displayItemList->clientCacheIsValid(layoutObject.displayItemClient()));
 
-        layoutObject.setPreviousPaintOffset(paintOffset);
+        layoutObject.mutableForPainting().setPreviousPaintOffset(paintOffset);
     }
 
     Optional<DisplayItemCacheSkipper> m_cacheSkipper;
     Optional<DrawingRecorder> m_drawingRecorder;
 };
 
 } // namespace blink
 
 #endif // LayoutObjectDrawingRecorder_h