Change PaintLayer::m_layoutObject to a reference.

third_party/WebKit/Source/core/paint/PaintInvalidator.cpp

 // 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.
 
 #include "core/paint/PaintInvalidator.h"
 
 #include "core/editing/FrameSelection.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
@@ skipping 192 matching lines @@
   } else if (object.isColumnSpanAll() ||
              object.isFloatingWithNonContainingBlockParent()) {
     // See LayoutObject::paintingLayer() for the special-cases of floating under
     // inline and multicolumn.
     context.paintingLayer = object.paintingLayer();
   }
 
   if (object.isLayoutBlockFlow() && toLayoutBlockFlow(object).containsFloats())
     context.paintingLayer->setNeedsPaintPhaseFloat();
 
-  if (object == context.paintingLayer->layoutObject())
+  if (&object == &context.paintingLayer->layoutObject())
     return;
 
   if (object.styleRef().hasOutline())
     context.paintingLayer->setNeedsPaintPhaseDescendantOutlines();
 
   if (object.hasBoxDecorationBackground()
       // We also paint overflow controls in background phase.
       || (object.hasOverflowClip() &&
           toLayoutBox(object).getScrollableArea()->hasOverflowControls())) {
     context.paintingLayer->setNeedsPaintPhaseDescendantBlockBackgrounds();
@@ skipping 223 matching lines @@
         PaintInvalidatorContext::ForcedSubtreeInvalidationRectUpdate;
 }
 
 void PaintInvalidator::processPendingDelayedPaintInvalidations() {
   for (auto target : m_pendingDelayedPaintInvalidations)
     target->getMutableForPainting().setShouldDoFullPaintInvalidation(
         PaintInvalidationDelayedFull);
 }
 
 }  // namespace blink