Introduce Promises.

LayoutTests/fast/js/Promise-init-expected.txt

Index: LayoutTests/fast/js/Promise-init-expected.txt
diff --git a/LayoutTests/fast/js/Promise-init-expected.txt b/LayoutTests/fast/js/Promise-init-expected.txt
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+Test Promise.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+PASS promise instanceof Promise is true
+PASS promise.constructor is Promise
+PASS thisInInit is promise
+PASS resolver instanceof PromiseResolver is true
+PASS resolver.constructor is PromiseResolver
+PASS new Promise() threw exception TypeError: Promise constructor takes a function argument.
+PASS new Promise(37) threw exception TypeError: Promise constructor takes a function argument.
+PASS promise = new Promise(function() { throw Error("foo"); }) did not throw exception.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+