Support the essential part of Shadow DOM v1

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

 /*
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#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