Change PaintLayer::m_layoutObject to a reference.

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

 // Copyright 2015 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/PrePaintTreeWalk.h"
 
 #include "core/dom/DocumentLifecycle.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/layout/LayoutMultiColumnSpannerPlaceholder.h"
@@ skipping 65 matching lines @@
   if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled())
     return;
 
   if (!object.hasLayer())
     return;
 
   PaintLayer* paintLayer = object.enclosingLayer();
   paintLayer->updateAncestorOverflowLayer(context.ancestorOverflowPaintLayer);
 
   if (object.styleRef().position() == EPosition::kSticky) {
-    paintLayer->layoutObject()->updateStickyPositionConstraints();
+    paintLayer->layoutObject().updateStickyPositionConstraints();
 
     // Sticky position constraints and ancestor overflow scroller affect the
     // sticky layer position, so we need to update it again here.
     // TODO(flackr): This should be refactored in the future to be clearer (i.e.
     // update layer position and ancestor inputs updates in the same walk).
     paintLayer->updateLayerPosition();
   }
 
   if (paintLayer->isRootLayer() || object.hasOverflowClip())
     context.ancestorOverflowPaintLayer = paintLayer;
@@ skipping 34 matching lines @@
 void PrePaintTreeWalk::invalidatePaintLayerOptimizationsIfNeeded(
     const LayoutObject& object,
     const PaintLayer& ancestorTransformedOrRootPaintLayer,
     PaintPropertyTreeBuilderContext& context) {
   if (!object.hasLayer())
     return;
 
   PaintLayer& paintLayer = *toLayoutBoxModelObject(object).layer();
   PropertyTreeState ancestorState =
       *ancestorTransformedOrRootPaintLayer.layoutObject()
-           ->paintProperties()
+           .paintProperties()
            ->localBorderBoxProperties();
 
 #ifdef CHECK_CLIP_RECTS
   ShouldRespectOverflowClipType respectOverflowClip = RespectOverflowClip;
 #endif
   if (ancestorTransformedOrRootPaintLayer.compositingState() ==
           PaintsIntoOwnBacking &&
       ancestorTransformedOrRootPaintLayer.layoutObject()
-          ->paintProperties()
+          .paintProperties()
           ->overflowClip()) {
     ancestorState.setClip(ancestorTransformedOrRootPaintLayer.layoutObject()
-                              ->paintProperties()
+                              .paintProperties()
                               ->overflowClip());
 #ifdef CHECK_CLIP_RECTS
     respectOverflowClip = IgnoreOverflowClip;
 #endif
   }
 
 #ifdef CHECK_CLIP_RECTS
   ClipRects& oldClipRects = paintLayer.clipper().paintingClipRects(
       &ancestorTransformedOrRootPaintLayer, respectOverflowClip, LayoutSize());
 #endif
 
   bool hasClip = false;
   RefPtr<ClipRects> clipRects = ClipRects::create();
   clipRects->setOverflowClipRect(clipRectForContext(
       context.current, context.currentEffect, ancestorState,
-      ancestorTransformedOrRootPaintLayer.layoutObject()->paintOffset(),
+      ancestorTransformedOrRootPaintLayer.layoutObject().paintOffset(),
       hasClip));
 #ifdef CHECK_CLIP_RECTS
   CHECK(!hasClip ||
         clipRects->overflowClipRect() == oldClipRects.overflowClipRect())
       << "rect= " << clipRects->overflowClipRect().toString();
 #endif
 
   clipRects->setFixedClipRect(clipRectForContext(
       context.fixedPosition, context.currentEffect, ancestorState,
-      ancestorTransformedOrRootPaintLayer.layoutObject()->paintOffset(),
+      ancestorTransformedOrRootPaintLayer.layoutObject().paintOffset(),
       hasClip));
 #ifdef CHECK_CLIP_RECTS
   CHECK(hasClip || clipRects->fixedClipRect() == oldClipRects.fixedClipRect())
       << " fixed=" << clipRects->fixedClipRect().toString();
 #endif
 
   clipRects->setPosClipRect(clipRectForContext(
       context.absolutePosition, context.currentEffect, ancestorState,
-      ancestorTransformedOrRootPaintLayer.layoutObject()->paintOffset(),
+      ancestorTransformedOrRootPaintLayer.layoutObject().paintOffset(),
       hasClip));
 #ifdef CHECK_CLIP_RECTS
   CHECK(!hasClip || clipRects->posClipRect() == oldClipRects.posClipRect())
       << " abs=" << clipRects->posClipRect().toString();
 #endif
 
   ClipRects* previousClipRects = paintLayer.previousPaintingClipRects();
 
   if (!previousClipRects || *clipRects != *previousClipRects) {
     paintLayer.setNeedsRepaint();
@@ skipping 64 matching lines @@
           roundedIntPoint(context.treeBuilderContext.current.paintOffset);
       walk(*toFrameView(widget), context);
     }
     // TODO(pdr): Investigate RemoteFrameView (crbug.com/579281).
   }
 
   object.getMutableForPainting().clearPaintFlags();
 }
 
 }  // namespace blink