Measure XPath usage

Source/core/xml/DocumentXPathEvaluator.idl

Index: Source/core/xml/DocumentXPathEvaluator.idl
diff --git a/Source/core/xml/DocumentXPathEvaluator.idl b/Source/core/xml/DocumentXPathEvaluator.idl
index 3ef7c2d91f80530254f95239ec99c5da2e7fe099..8380ad0f4bf31f653c08d5eace91945bd79ef9a4 100644
--- a/Source/core/xml/DocumentXPathEvaluator.idl
+++ b/Source/core/xml/DocumentXPathEvaluator.idl
@@ -19,10 +19,10 @@
 
 partial interface Document {
     // DOM Level 3 XPath (XPathEvaluator interface)
-    [RaisesException] XPathExpression createExpression([Default=Undefined] optional DOMString expression,
+    [MeasureAs=DocumentXPathCreateExpression, RaisesException] XPathExpression createExpression([Default=Undefined] optional DOMString expression,
                                                        [Default=Undefined] optional XPathNSResolver resolver);
-    XPathNSResolver    createNSResolver(Node nodeResolver);
-    [Custom, RaisesException] XPathResult evaluate([Default=Undefined] optional DOMString expression,
+    [MeasureAs=DocumentXPathCreateNSResolver] XPathNSResolver    createNSResolver(Node nodeResolver);
+    [Custom, MeasureAs=DocumentXPathEvaluate, RaisesException] XPathResult evaluate([Default=Undefined] optional DOMString expression,
                                                    [Default=Undefined] optional Node contextNode,
                                                    [Default=Undefined] optional XPathNSResolver resolver,
                                                    [Default=Undefined] optional unsigned short type,