IDL compiler: [ImplementedAs] for [InitializedByEventConstructor]

Source/bindings/tests/idls/TestInterfaceEventConstructor.idl

Index: Source/bindings/tests/idls/TestInterfaceEventConstructor.idl
diff --git a/Source/bindings/tests/idls/TestInterfaceEventConstructor.idl b/Source/bindings/tests/idls/TestInterfaceEventConstructor.idl
index d17e006f55bb74be574af3ca23bf77f15990c991..5542cec6616dde0cabe6970a28531ede7247dfc0 100644
--- a/Source/bindings/tests/idls/TestInterfaceEventConstructor.idl
+++ b/Source/bindings/tests/idls/TestInterfaceEventConstructor.idl
@@ -31,6 +31,8 @@
 ] interface TestInterfaceEventConstructor : Event {
     readonly attribute DOMString readonlyStringAttribute;
     [InitializedByEventConstructor] readonly attribute DOMString initializedByEventConstructorReadonlyStringAttribute;
-    [DeprecateAs=initializedByEventConstructorReadonlyStringAttribute, InitializedByEventConstructor] readonly attribute DOMString deprecatedInitializedByEventConstructorReadonlyStringAttribute;
     [InitializedByEventConstructor] readonly attribute any initializedByEventConstructorReadonlyAnyAttribute;
+    [DeprecateAs=initializedByEventConstructorReadonlyStringAttribute, InitializedByEventConstructor] readonly attribute DOMString deprecatedInitializedByEventConstructorReadonlyStringAttribute;
+    [ImplementedAs=implementedAsName, InitializedByEventConstructor] readonly attribute DOMString implementedAsInitializedByEventConstructorReadonlyStringAttribute;
+    [DeprecateAs=initializedByEventConstructorReadonlyStringAttribute, ImplementedAs=deprecatedImplementedAsName, InitializedByEventConstructor] readonly attribute DOMString deprecatedImplementedAsInitializedByEventConstructorReadonlyStringAttribute;
 };