Use the baseline information exposed by C++ to pipe baseline data through RenderBox.

sky/engine/core/rendering/RenderFlexibleBox.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 29 matching lines @@
 public:
     RenderFlexibleBox(ContainerNode*);
     virtual ~RenderFlexibleBox();
 
     virtual const char* renderName() const override;
 
     virtual bool isFlexibleBox() const override final { return true; }
     void layout();
 
     virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
-    virtual int firstLineBoxBaseline() const override;
+    virtual int firstLineBoxBaseline(FontBaselineOrAuto baselineType) const override;
     virtual int inlineBlockBaseline(LineDirectionMode) const override;
 
     virtual void paintChildren(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers) override final;
 
     bool isHorizontalFlow() const;
 
 protected:
     virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
 
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
@@ skipping 94 matching lines @@
 
     mutable OrderIterator m_orderIterator;
     int m_numberOfInFlowChildrenOnFirstLine;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderFlexibleBox, isFlexibleBox());
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERFLEXIBLEBOX_H_