Import Blink layout tests for Promises.

test/webkit/fast/js/Promise-then-without-callbacks.js

Index: test/webkit/fast/js/Promise-then-without-callbacks.js
diff --git a/test/webkit/indexed-setter-on-global-object.js b/test/webkit/fast/js/Promise-then-without-callbacks.js
similarity index 78%
copy from test/webkit/indexed-setter-on-global-object.js
copy to test/webkit/fast/js/Promise-then-without-callbacks.js
index 20c70c24f5e5b8f887cc8ec8f1d4fbd99431c45d..27ab4234a404d01be5860714e823e392c7d892c9 100644
--- a/test/webkit/indexed-setter-on-global-object.js
+++ b/test/webkit/fast/js/Promise-then-without-callbacks.js
@@ -1,4 +1,4 @@
-// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright 2014 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
@@ -21,16 +21,15 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-description(
-"Tests that creating an indexed setter on the global object doesn't break things."
-);
+// Flags: --harmony
+'use strict';
+description('Promise.prototype.then should work without callbacks.');
 
-var thingy;
-
-this.__defineSetter__(42, function(value) {
-    thingy = value;
+var result;
+new Promise(function(resolve) { resolve('hello'); }).then(
+  // then without callbacks
+).then(function(localResult) {
+  result = localResult;
+  shouldBeEqualToString('result', 'hello');
+  finishJSTest();
 });
-
-this[42] = "foo";
-
-shouldBe("thingy", "\"foo\"");