Add UseCounter for Document.registerElement()

Source/core/dom/Document.idl

Index: Source/core/dom/Document.idl
diff --git a/Source/core/dom/Document.idl b/Source/core/dom/Document.idl
index ea5647cc24bcbce4e12f40b140e723ceed4593f3..e43d2d655032493d75ceb04415b21b7ca27c620e 100644
--- a/Source/core/dom/Document.idl
+++ b/Source/core/dom/Document.idl
@@ -204,7 +204,7 @@ typedef (CanvasRenderingContext2D or WebGLRenderingContext) RenderingContext;
                                                [Default=Undefined] optional float webkitForce);
     [RuntimeEnabled=Touch] TouchList createTouchList(Touch... touches);
 
-    [CallWith=ScriptState, CustomElementCallbacks, RaisesException] CustomElementConstructor registerElement(DOMString name, optional Dictionary options);
+    [CallWith=ScriptState, CustomElementCallbacks, RaisesException, MeasureAs=DocumentRegisterElement] CustomElementConstructor registerElement(DOMString name, optional Dictionary options);
     [CustomElementCallbacks, PerWorldBindings, LogActivity, RaisesException] Element createElement(DOMString localName, [TreatNullAs=NullString] DOMString typeExtension);
     [CustomElementCallbacks, PerWorldBindings, LogActivity, RaisesException] Element createElementNS([TreatNullAs=NullString] DOMString namespaceURI, DOMString qualifiedName,
                             [TreatNullAs=NullString] DOMString typeExtension);
@@ -224,4 +224,3 @@ typedef (CanvasRenderingContext2D or WebGLRenderingContext) RenderingContext;
 
 Document implements GlobalEventHandlers;
 Document implements ParentNode;
-