Add DCHECK(rootBox) to InlineFlowBox::computeLogicalBoxHeights

third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc.
  *               All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 610 matching lines @@
     InlineFlowBox* inlineFlowBox =
         curr->isInlineFlowBox() ? toInlineFlowBox(curr) : nullptr;
 
     bool affectsAscent = false;
     bool affectsDescent = false;
 
     // The verticalPositionForBox function returns the distance between the
     // child box's baseline and the root box's baseline. The value is negative
     // if the child box's baseline is above the root box's baseline, and it is
     // positive if the child box's baseline is below the root box's baseline.
+    DCHECK(rootBox);
     curr->setLogicalTop(
         rootBox->verticalPositionForBox(curr, verticalPositionCache));
 
     int ascent = 0;
     int descent = 0;
     rootBox->ascentAndDescentForBox(curr, textBoxDataMap, ascent, descent,
                                     affectsAscent, affectsDescent);
 
     LayoutUnit boxHeight(ascent + descent);
     if (curr->verticalAlign() == EVerticalAlign::Top) {
@@ skipping 1006 matching lines @@
     ASSERT(child->prevOnLine() == prev);
     prev = child;
   }
   ASSERT(prev == m_lastChild);
 #endif
 }
 
 #endif
 
 }  // namespace blink