Add extended attribute, [Measure], to simplify use counting

Source/bindings/tests/idls/core/TestInterface.idl

Index: Source/bindings/tests/idls/core/TestInterface.idl
diff --git a/Source/bindings/tests/idls/core/TestInterface.idl b/Source/bindings/tests/idls/core/TestInterface.idl
index 4c945efa43f1a9aa2a6c9d6e7c321801079f562b..3dc2179311b5484b68824c5beebeed699414b86d 100644
--- a/Source/bindings/tests/idls/core/TestInterface.idl
+++ b/Source/bindings/tests/idls/core/TestInterface.idl
@@ -38,6 +38,7 @@
     DoNotCheckConstants,
     ImplementedAs=TestInterfaceImplementation,
     Iterable,
+    Measure,
     RuntimeEnabled=FeatureName,
     SetWrapperReferenceTo(TestInterface referencedName),
     TypeChecking=(Interface,Unrestricted),
@@ -49,7 +50,7 @@
     const unsigned long UNSIGNED_LONG = 0;
     [Reflect=CONST_CPP] const short CONST_JAVASCRIPT = 1;
 
-    attribute TestInterface testInterfaceAttribute; // Self-referential interface type with [ImplementedAs]
+    [Measure] attribute TestInterface testInterfaceAttribute; // Self-referential interface type with [ImplementedAs]
     attribute TestInterfaceConstructor testInterfaceConstructorAttribute;
     attribute double doubleAttribute;
     attribute float floatAttribute;