Consider slots as a focus scope

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

Index: third_party/WebKit/Source/core/dom/AssignedNodeTraversal.h
diff --git a/third_party/WebKit/Source/core/html/HTMLTagCollection.cpp b/third_party/WebKit/Source/core/dom/AssignedNodeTraversal.h
similarity index 62%
copy from third_party/WebKit/Source/core/html/HTMLTagCollection.cpp
copy to third_party/WebKit/Source/core/dom/AssignedNodeTraversal.h
index ba08802fd2aa3c633f58e2ea62797aff1381a5fa..ae8e67150c92b280da21417adda270dfdeb0be75 100644
--- a/third_party/WebKit/Source/core/html/HTMLTagCollection.cpp
+++ b/third_party/WebKit/Source/core/dom/AssignedNodeTraversal.h
@@ -2,8 +2,8 @@
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
- * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
- * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2014 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ -20,17 +20,24 @@
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
+ *
  */
 
-#include "HTMLTagCollection.h"
-
-namespace blink {
+#ifndef AssignedNodeTraversal_h
+#define AssignedNodeTraversal_h
 
-HTMLTagCollection::HTMLTagCollection(ContainerNode& rootNode, const AtomicString& localName)
-    : TagCollection(rootNode, HTMLTagCollectionType, starAtom, localName)
-    , m_loweredLocalName(localName.lower())
-{
-    ASSERT(rootNode.document().isHTMLDocument());
-}
+#include "core/dom/Node.h"
+#include "core/html/HTMLSlotElement.h"
 
+namespace blink {
+class AssignedNodeTraversal {
+public:
+    static HTMLSlotElement* slot(const Node& current);
+    static Node* assignedParent(const Node& current);
+    static Node* next(const Node& current);
+    static Node* previous(const Node& current);
+    static bool isInAssignedScope(const Node& current);
+};
 } // namespace blink
+
+#endif