Fix DCHECK to account for child SVG objects not having PaintLayers.

third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp

 // 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.
 
 #include "core/layout/compositing/CompositingInputsUpdater.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/FrameView.h"
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutView.h"
@@ skipping 34 matching lines @@
     }
 
     if (current->HasLayer())
       return static_cast<const LayoutBoxModelObject*>(current)->Layer();
     // Having clip or overflow clip forces the LayoutObject to become a layer,
     // except for contains: paint, which may apply to SVG, and
     // control clip, which may apply to LayoutBox subtypes.
     // SVG (other than LayoutSVGRoot) cannot have PaintLayers.
     DCHECK(!current->HasClipRelatedProperty() ||
            current->StyleRef().ContainsPaint() ||
-           (current->IsBox() && ToLayoutBox(current)->HasControlClip()));
+           (current->IsBox() && ToLayoutBox(current)->HasControlClip()) ||
+           current->IsSVGChild());
   }
   NOTREACHED();
   return nullptr;
 }
 
 static const PaintLayer* FindParentLayerOnContainingBlockChain(
     const LayoutObject* object) {
   for (const LayoutObject* current = object; current;
        current = current->ContainingBlock()) {
     if (current->HasLayer())
@@ skipping 219 matching lines @@
   DCHECK(!layer->NeedsCompositingInputsUpdate());
 
   for (PaintLayer* child = layer->FirstChild(); child;
        child = child->NextSibling())
     AssertNeedsCompositingInputsUpdateBitsCleared(child);
 }
 
 #endif
 
 }  // namespace blink