Bug 75942

To make the test result of TestSupplemental.idl readable (i.e. to make it easy to find in {JS,V8,ObjC,GObject,CPP}TestInterface.cpp which attributes originate from TestSupplemental.idl), we should rename the attributes in TestSupplemental.idl, like this: Before: interface [ Supplemental=TestInterface ] TestSupplemental { readonly attribute DOMString str1; attribute DOMString str2; attribute [CustomGetter, CustomSetter] str3; }; After: interface [ Supplemental=TestInterface ] TestSupplemental { readonly attribute DOMString supplementalStr1; attribute DOMString supplementalStr2; attribute [CustomGetter, CustomSetter] supplementalStr3; };