Update styleRecalc so that it traverses shadow insertion points in 2 pass algorithms

Source/core/dom/shadow/ElementShadow.h

Index: Source/core/dom/shadow/ElementShadow.h
diff --git a/Source/core/dom/shadow/ElementShadow.h b/Source/core/dom/shadow/ElementShadow.h
index 9017ddcafb749cd8dba150e69abdcc23885c3877..3f32f46d0238d3ee772d3dee098aa7a14a0ed169 100644
--- a/Source/core/dom/shadow/ElementShadow.h
+++ b/Source/core/dom/shadow/ElementShadow.h
@@ -67,6 +67,7 @@ public:
 
     void distributeIfNeeded();
     void setNeedsDistributionRecalc();
+    bool needsDistributionRecalc() const { return m_needsDistributionRecalc; }
 
     const InsertionPoint* finalDestinationInsertionPointFor(const Node*) const;
     const DestinationInsertionPoints* destinationInsertionPointsFor(const Node*) const;
@@ -118,6 +119,13 @@ inline ShadowRoot* Element::youngestShadowRoot() const
     return 0;
 }
 
+inline ShadowRoot* Element::oldestShadowRoot() const
+{
+    if (ElementShadow* shadow = this->shadow())
+        return shadow->oldestShadowRoot();
+    return 0;
+}
+
 inline ElementShadow* ElementShadow::containingShadow() const
 {
     if (ShadowRoot* parentRoot = host()->containingShadowRoot())