Relayout RenderObjects with viewport-percentage CSS properties when viewport size changes

Source/core/rendering/RenderView.h

Index: Source/core/rendering/RenderView.h
diff --git a/Source/core/rendering/RenderView.h b/Source/core/rendering/RenderView.h
index 97702b0703b758763aa0406d3f0f3dba01365835..2ce173e0f9fb76d2a7914a0d37a6e9206b89f2ec 100644
--- a/Source/core/rendering/RenderView.h
+++ b/Source/core/rendering/RenderView.h
@@ -214,6 +214,9 @@ public:
     LayoutUnit viewportPercentageMin(float percentage) const;
     LayoutUnit viewportPercentageMax(float percentage) const;
 
+    void addViewportPercentageStyleObject(RenderObject*);
+    void removeViewportPercentageStyleObject(RenderObject*);
+
 private:
     virtual void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0) const OVERRIDE;
     virtual const RenderObject* pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const OVERRIDE;
@@ -305,6 +308,9 @@ private:
     OwnPtr<FlowThreadController> m_flowThreadController;
     RefPtr<IntervalArena> m_intervalArena;
 
+    typedef HashSet<RenderObject*> ViewportPercentageStyleObjectSet;
+    OwnPtr<ViewportPercentageStyleObjectSet> m_viewportPercentageStyleObjects;
+
     RenderQuote* m_renderQuoteHead;
     unsigned m_renderCounterCount;
 };