[Font Load Events] Partial implementation of SetClass operations for FontFaceSet

Source/core/css/FontFaceSet.idl

Index: Source/core/css/FontFaceSet.idl
diff --git a/Source/core/css/FontFaceSet.idl b/Source/core/css/FontFaceSet.idl
index 643c335b562458e8ebea329064a7ef0cb6c0f0c5..1dc2b877955b858a8d312ab3d2840ec5ca3b69c0 100644
--- a/Source/core/css/FontFaceSet.idl
+++ b/Source/core/css/FontFaceSet.idl
@@ -46,5 +46,13 @@ enum FontFaceSetLoadStatus { "loading", "loaded" };
     [RaisesException] Promise load(DOMString font, [Default=NullString] optional DOMString text);
     Promise ready();
 
+    void forEach(FontFaceSetForEachCallback callback, optional any thisArg);
+    [RaisesException] boolean has(FontFace fontFace);
+    // FIXME: implement them
+    // void add(FontFace fontFace);
+    // void clear();
+    // boolean delete(FontFace fontFace);
+
+    readonly attribute unsigned long size;
     readonly attribute FontFaceSetLoadStatus status;
 };