Add grid/flex layout support for <fieldset>

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

 /*
  * 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 41 matching lines @@
     int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
     int firstLineBoxBaseline() const override;
     int inlineBlockBaseline(LineDirectionMode) const override;
     IntSize originAdjustmentForScrollbars() const override;
     bool hasTopOverflow() const override;
     bool hasLeftOverflow() const override;
 
     void paintChildren(const PaintInfo&, const LayoutPoint&) const final;
 
     bool isHorizontalFlow() const;
+    virtual LayoutObject* layoutSpecialExcludedChild(bool /*relayoutChildren*/, SubtreeLayoutScope&) {return nullptr;};
 
     const OrderIterator& orderIterator() const { return m_orderIterator; }
 
     LayoutUnit crossSizeForPercentageResolution(const LayoutBox& child);
     LayoutUnit mainSizeForPercentageResolution(const LayoutBox& child);
     LayoutUnit childLogicalHeightForPercentageResolution(const LayoutBox& child);
 
     void clearCachedMainSizeForChild(const LayoutBox& child);
 
     LayoutUnit staticMainAxisPositionForPositionedChild(const LayoutBox& child);
@@ skipping 96 matching lines @@
 
     LayoutUnit availableAlignmentSpaceForChild(LayoutUnit lineCrossAxisExtent, const LayoutBox& child);
     LayoutUnit availableAlignmentSpaceForChildBeforeStretching(LayoutUnit lineCrossAxisExtent, const LayoutBox& child);
     LayoutUnit marginBoxAscentForChild(const LayoutBox& child);
 
     LayoutUnit computeChildMarginValue(Length margin);
     void prepareOrderIteratorAndMargins();
     LayoutUnit adjustChildSizeForMinAndMax(const LayoutBox& child, LayoutUnit childSize);
     LayoutUnit adjustChildSizeForAspectRatioCrossAxisMinAndMax(const LayoutBox& child, LayoutUnit childSize);
     // The hypothetical main size of an item is the flex base size clamped according to its min and max main size properties
-    bool computeNextFlexLine(OrderedFlexItemList& orderedChildren, LayoutUnit& sumFlexBaseSize, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink, LayoutUnit& sumHypotheticalMainSize, bool relayoutChildren);
+    bool computeNextFlexLine(OrderedFlexItemList& orderedChildren, LayoutUnit& sumFlexBaseSize, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink, LayoutUnit& sumHypotheticalMainSize, bool relayoutChildren, SubtreeLayoutScope&);
 
     void freezeInflexibleItems(FlexSign, OrderedFlexItemList& children, LayoutUnit& remainingFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink);
     bool resolveFlexibleLengths(FlexSign, OrderedFlexItemList&, LayoutUnit initialFreeSpace, LayoutUnit& remainingFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink);
     void freezeViolations(Vector<FlexItem*>&, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink);
 
     void resetAutoMarginsAndLogicalTopInCrossAxis(LayoutBox& child);
     void setOverrideMainAxisContentSizeForChild(LayoutBox& child, LayoutUnit childPreferredSize);
     void prepareChildForPositionedLayout(LayoutBox& child);
     size_t numberOfInFlowPositionedChildren(const OrderedFlexItemList&) const;
     void layoutAndPlaceChildren(LayoutUnit& crossAxisOffset, const OrderedFlexItemList&, LayoutUnit availableFreeSpace, bool relayoutChildren, SubtreeLayoutScope&, Vector<LineContext>&);
@@ skipping 19 matching lines @@
 
     // This is SizeIsUnknown outside of layoutBlock()
     mutable SizeDefiniteness m_hasDefiniteHeight;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFlexibleBox, isFlexibleBox());
 
 } // namespace blink
 
 #endif // LayoutFlexibleBox_h