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..c3e4a2ea723cb25c99e19ab2bfc5150a5c56a30e 100644
--- a/LayoutTests/fast/js/iterable-object.html
+++ b/LayoutTests/fast/js/iterable-object.html
@@ -28,6 +28,30 @@ for (var entry of internals.entries()) {
     debug('entry = ' + entry);
 }
 
+shouldThrow('internals.forEach("not a function")');
+shouldThrow('internals.forEach(function () { debug("callback called"); throw Error("stop!"); })');
+internals.forEach(function (value, key, object) {
+    debug(this + ', ' + value + ', ' + key + ', ' + object);
+}, 'thisArg');
+internals.forEach(function (value) {
+    debug(value + ': ' + this);
+});
+internals.forEach(function (value) {
+    debug(value + ': ' + this);
+}, null);
+internals.forEach(function (value) {
+    'use strict';
+    debug(value + ': ' + this);
+});
+internals.forEach(function (value) {
+    'use strict';
+    debug(value + ': ' + this);
+}, null);
+internals.forEach(function (value) {
+    'use strict';
+    debug(value + ': ' + typeof this);
+}, 3.14);
+
 </script>
 </body>
 </html>