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

Source/core/css/FontFaceSetForEachCallback.idl

Index: Source/core/css/FontFaceSetForEachCallback.idl
diff --git a/Source/bindings/tests/idls/TestInterfaceEmpty.idl b/Source/core/css/FontFaceSetForEachCallback.idl
similarity index 86%
copy from Source/bindings/tests/idls/TestInterfaceEmpty.idl
copy to Source/core/css/FontFaceSetForEachCallback.idl
index d9474d54136bb35f5d4d5842ac6a175b94ca6343..6b9fdab77312acc0b803f383685c58c8a2ea420a 100644
--- a/Source/bindings/tests/idls/TestInterfaceEmpty.idl
+++ b/Source/core/css/FontFaceSetForEachCallback.idl
@@ -28,5 +28,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-interface TestInterfaceEmpty {
+callback interface FontFaceSetForEachCallback {
+    [CallWith=ThisValue] boolean handleItem(FontFace fontFace, FontFace fontFaceAgain, FontFaceSet set);
+    boolean handleItem(FontFace fontFace, FontFace fontFaceAgain, FontFaceSet set);
 };