WebKit IDL roll.

third_party/WebCore/html/HTMLDocument.idl

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
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     readonly attribute long width;
     readonly attribute long height;
              [TreatNullAs=NullString] attribute DOMString dir;
              [TreatNullAs=NullString] attribute DOMString designMode;
     readonly attribute DOMString compatMode;
 
     readonly attribute Element activeElement;
     boolean hasFocus();
 
+#if defined(ENABLE_CUSTOM_ELEMENTS) && ENABLE_CUSTOM_ELEMENTS
+    [V8EnabledAtRuntime=customDOMElements, Conditional=CUSTOM_ELEMENTS, ImplementedAs=registerElement, CallWith=ScriptState]
+    CustomElementConstructor webkitRegister(in DOMString name, in [Optional] Dictionary options) raises(DOMException);
+#endif
+
     // Deprecated attributes
              [TreatNullAs=NullString] attribute DOMString bgColor;
              [TreatNullAs=NullString] attribute DOMString fgColor;
              [TreatNullAs=NullString] attribute DOMString alinkColor;
              [TreatNullAs=NullString] attribute DOMString linkColor;
              [TreatNullAs=NullString] attribute DOMString vlinkColor;
 };