IDL: Add support for [Unscopeable] on attributes and methods

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 486f8b1112f44f47b3cce526b48ac0d7b5cc9460..51143d6522f68b48992185bb13bc4d40de4bbeb2 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -2358,5 +2358,14 @@ bool Internals::isUseCounted(Document* document, int useCounterId)
     return UseCounter::isCounted(*document, static_cast<UseCounter::Feature>(useCounterId));
 }
 
+String Internals::unscopeableAttribute()
+{
+    return "unscopeableAttribute";
+}
+
+String Internals::unscopeableMethod()
+{
+    return "unscopeableMethod";
+}
 
 } // namespace blink