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

Source/core/dom/shadow/ShadowRoot.cpp

Index: Source/core/dom/shadow/ShadowRoot.cpp
diff --git a/Source/core/dom/shadow/ShadowRoot.cpp b/Source/core/dom/shadow/ShadowRoot.cpp
index c9f7909eae3983efad4456902a4d9475f4412efb..d5a579c82a6b38f6deb0f720dfe2e3b9ef348c86 100644
--- a/Source/core/dom/shadow/ShadowRoot.cpp
+++ b/Source/core/dom/shadow/ShadowRoot.cpp
@@ -161,6 +161,14 @@ bool ShadowRoot::childTypeAllowed(NodeType type) const
     }
 }
 
+InsertionPoint* ShadowRoot::shadowInsertionPoint() const
+{
+    ASSERT(!owner()->needsDistributionRecalc());
+    if (isOldest())
+        return 0;
+    return olderShadowRoot()->shadowInsertionPointOfYoungerShadowRoot();
+}
+
 void ShadowRoot::recalcStyle(StyleRecalcChange change)
 {
     // ShadowRoot doesn't support custom callbacks.
@@ -177,13 +185,14 @@ void ShadowRoot::recalcStyle(StyleRecalcChange change)
 
     // FIXME: This doesn't handle :hover + div properly like Element::recalcStyle does.
     Text* lastTextNode = 0;
+    InsertionPoint* shadowInsertionPointInShadowTree = shadowInsertionPoint();
     for (Node* child = lastChild(); child; child = child->previousSibling()) {
         if (child->isTextNode()) {
             toText(child)->recalcTextStyle(change, lastTextNode);
             lastTextNode = toText(child);
         } else if (child->isElementNode()) {
             if (shouldRecalcStyle(change, child))
-                toElement(child)->recalcStyle(change, lastTextNode);
+                toElement(child)->recalcStyle(change, lastTextNode, shadowInsertionPointInShadowTree);
             if (child->renderer())
                 lastTextNode = 0;
         }