IDL roll.

core/dom/NamedFlow.idl

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 10 matching lines @@
  * 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.
  */
 
 [
+    EnabledAtRuntime=cssRegions,
     EventTarget,
     InterfaceName=WebKitNamedFlow,
     GenerateIsReachable=ImplOwnerNodeRoot
 ] interface NamedFlow {
     readonly attribute DOMString name;
     readonly attribute boolean overset;
     readonly attribute long firstEmptyRegionIndex;
     NodeList getRegionsByContent(Node contentNode);
     NodeList getRegions();
     NodeList getContent();
 
     // EventTarget interface
     void addEventListener(DOMString type, 
                           EventListener listener, 
                           optional boolean useCapture);
     void removeEventListener(DOMString type, 
                              EventListener listener, 
                              optional boolean useCapture);
     [RaisesException] boolean dispatchEvent(Event event);
 };