Support the essential part of Shadow DOM v1

third_party/WebKit/Source/core/dom/shadow/SlotAssignment.h

 /*

[tkent, 2015/12/10 04:23:02]

Use the 3-line header.

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-#ifndef HTMLSlotElement_h
-#define HTMLSlotElement_h
+#ifndef SlotAssignment_h
+#define SlotAssignment_h
 
-#include "core/CoreExport.h"
-#include "core/html/HTMLElement.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
-class CORE_EXPORT HTMLSlotElement final : public HTMLElement {
-    DEFINE_WRAPPERTYPEINFO();
+class HTMLSlotElement;
+class Node;
+class ShadowRoot;
+
+class SlotAssignment final {
 public:
-    static PassRefPtrWillBeRawPtr<HTMLSlotElement> create(Document&);
-    ~HTMLSlotElement() override;
+    SlotAssignment() { }
+    HTMLSlotElement* assignedSlotFor(const Node&) const;
+    void resolveAssignment(const ShadowRoot&);
 
-    DECLARE_VIRTUAL_TRACE();
+    DECLARE_TRACE();
 
 private:
-    HTMLSlotElement(Document&);
-
-    AtomicString m_name;
+    void assign(Node&, HTMLSlotElement&);
+    WillBeHeapHashMap<RawPtrWillBeMember<Node>, RawPtrWillBeMember<HTMLSlotElement>> m_assignment;
 };
 
 } // namespace blink
 
-#endif // HTMLSlotElement_h
+#endif // HTMLSlotAssignment_h