IDL: Add forEach() method to iterable<>/maplike<>/setlike<> interfaces

LayoutTests/fast/js/iterable-object.html

Index: LayoutTests/fast/js/iterable-object.html
diff --git a/LayoutTests/fast/js/iterable-object.html b/LayoutTests/fast/js/iterable-object.html
index 70e481af7491b1f4fe2aaafb565767a8d754e52c..94663cbd18e4595af14486fa12d18d97a2f3a436 100644
--- a/LayoutTests/fast/js/iterable-object.html
+++ b/LayoutTests/fast/js/iterable-object.html
@@ -28,6 +28,10 @@ for (var entry of internals.entries()) {
     debug('entry = ' + entry);
 }
 
+internals.forEach(function (value, key, object) {

[jsbell, 2015/01/22 19:53:54]

Can you add cases for:

* Calling forEach w/ a non-function argument? (will throw)

* Calling forEach w/o a thisArg? (should be global or undefined, depending on
strictness, I think?)

[Jens Widell, 2015/01/23 11:08:14]

Done.

Also added cases for the callback function throwing, and some other thisArg
variants, with and without a strict mode callback function.

+    debug(this + ', ' + value + ', ' + key + ', ' + object);
+}, 'thisArg');
+
 </script>
 </body>
 </html>