[css-flexbox] Have to use forceChildLayout to force layout

third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp

 /*
  * Copyright (C) 2011 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1230 matching lines @@
             continue;
         }
 
         ChildLayoutType layoutType = relayoutChildren ? ForceLayout : LayoutIfNeeded;
 
         // If this condition is true, then computeMainAxisExtentForChild will call child.intrinsicContentLogicalHeight()
         // and child.scrollbarLogicalHeight(), so if the child has intrinsic min/max/preferred size,
         // run layout on it now to make sure its logical height and scroll bars are up to date.
         if (childHasIntrinsicMainAxisSize(*child) && child->needsLayout()) {
             child->clearOverrideSize();
-            child->layoutIfNeeded();
+            child->forceChildLayout();
             cacheChildMainSize(*child);
             layoutType = LayoutIfNeeded;
         }
 
         FlexItem flexItem = constructFlexItem(*child, layoutType);
         if (isMultiline() && sumHypotheticalMainSize + flexItem.hypotheticalMainAxisMarginBoxSize() > lineBreakLength && lineHasInFlowItem)
             break;
         orderedChildren.append(flexItem);
         lineHasInFlowItem  = true;
         sumFlexBaseSize += flexItem.flexBaseMarginBoxSize();
@@ skipping 660 matching lines @@
             DCHECK(child);
             LayoutUnit lineCrossAxisExtent = lineContexts[lineNumber].crossAxisExtent;
             LayoutUnit originalOffset = lineContexts[lineNumber].crossAxisOffset - crossAxisStartEdge;
             LayoutUnit newOffset = contentExtent - originalOffset - lineCrossAxisExtent;
             adjustAlignmentForChild(*child, newOffset - originalOffset);
         }
     }
 }
 
 } // namespace blink