Implement Promise.prototype.then and Promise.prototype.catch

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

Index: LayoutTests/fast/js/Promise-then-expected.txt
diff --git a/LayoutTests/fast/js/Promise-then-expected.txt b/LayoutTests/fast/js/Promise-then-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d7990795cdd268b2276738c205cd949b758fa914
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+++ b/LayoutTests/fast/js/Promise-then-expected.txt
@@ -0,0 +1,17 @@
+Test Promise.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+PASS thisInInit === firstPromise is true
+PASS firstPromise instanceof Promise is true
+PASS secondPromise instanceof Promise is true
+PASS firstPromise.then(null) threw exception TypeError: fulfillCallback must be a function or undefined.
+PASS firstPromise.then(undefined, null) threw exception TypeError: rejectCallback must be a function or undefined.
+PASS firstPromise.then(37) threw exception TypeError: fulfillCallback must be a function or undefined.
+PASS thisInFulfillCallback === firstPromise is false
+PASS thisInFulfillCallback === secondPromise is true
+PASS result is "hello"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+