Support slot element's fallback content feature

third_party/WebKit/Source/core/dom/Node.h

Index: third_party/WebKit/Source/core/dom/Node.h
diff --git a/third_party/WebKit/Source/core/dom/Node.h b/third_party/WebKit/Source/core/dom/Node.h
index d5b87bce6a6906ef75484818bb1e69df3972f076..c4d75f78a10f694643bfa483e695284d82432503 100644
--- a/third_party/WebKit/Source/core/dom/Node.h
+++ b/third_party/WebKit/Source/core/dom/Node.h
@@ -483,6 +483,11 @@ public:
     bool isInShadowTree() const { return getFlag(IsInShadowTreeFlag); }
     bool isInTreeScope() const { return getFlag(static_cast<NodeFlags>(InDocumentFlag | IsInShadowTreeFlag)); }
 
+    bool isInV1ShadowTree() const;
+    bool isInV0ShadowTree() const;
+    bool isChildOfV1ShadowHost() const;
+    bool isChildOfV0ShadowHost() const;
+
     bool isDocumentTypeNode() const { return nodeType() == DOCUMENT_TYPE_NODE; }
     virtual bool childTypeAllowed(NodeType) const { return false; }
     unsigned countChildren() const;
@@ -660,7 +665,7 @@ public:
 
     PassRefPtrWillBeRawPtr<StaticNodeList> getDestinationInsertionPoints();
     HTMLSlotElement* assignedSlot() const;
-    HTMLSlotElement* assignedSlotForBinding() { updateDistribution(); return assignedSlot(); }
+    HTMLSlotElement* assignedSlotForBinding();
 
     void setAlreadySpellChecked(bool flag) { setFlag(flag, AlreadySpellCheckedFlag); }
     bool isAlreadySpellChecked() { return getFlag(AlreadySpellCheckedFlag); }