Replace DCHECK with DCHECK_op and split some DCHECKs wherever necessary

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

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 174 matching lines @@
   if (layer->renderingContextRoot() != squashingLayer.renderingContextRoot())
     return SquashingDisallowedReasonRenderingContextMismatch;
 
   if (layer->hasFilterInducingProperty() ||
       layer->filterAncestor() != squashingLayer.filterAncestor())
     return SquashingDisallowedReasonFilterMismatch;
 
   if (layer->nearestFixedPositionLayer() !=
       squashingLayer.nearestFixedPositionLayer())
     return SquashingDisallowedReasonNearestFixedPositionMismatch;
-  DCHECK(layer->layoutObject().style()->position() != EPosition::kFixed);
+  DCHECK_NE(layer->layoutObject().style()->position(), EPosition::kFixed);
 
   if ((squashingLayer.layoutObject().style()->subtreeWillChangeContents() &&
        squashingLayer.layoutObject()
            .style()
            ->isRunningAnimationOnCompositor()) ||
       squashingLayer.layoutObject()
           .style()
           ->shouldCompositeForCurrentAnimations())
     return SquashingDisallowedReasonSquashingLayerIsAnimating;
 
@@ skipping 144 matching lines @@
   while (PaintLayerStackingNode* curNode = iterator.next())
     assignLayersToBackingsInternal(curNode->layer(), squashingState,
                                    layersNeedingPaintInvalidation);
 
   if (squashingState.hasMostRecentMapping &&
       &squashingState.mostRecentMapping->owningLayer() == layer)
     squashingState.haveAssignedBackingsToEntireSquashingLayerSubtree = true;
 }
 
 }  // namespace blink