Change Future.doWhile to use a loop for non-future results instead of recursion.

tests/lib/async/futures_test.dart

Index: tests/lib/async/futures_test.dart
diff --git a/tests/lib/async/futures_test.dart b/tests/lib/async/futures_test.dart
index a9a37e0df3246392a75b586ae123f54ba9fc8f3f..5f3b532173a128480019734ef1ada507cdf2b34e 100644
--- a/tests/lib/async/futures_test.dart
+++ b/tests/lib/async/futures_test.dart
@@ -238,6 +238,30 @@ Future testDoWhileWithException() {
   });
 }
 
+Future testDoWhileManyFutures() {
+  int n = 100000;
+  var ftrue = new Future.value(false);
+  var ffalse = new Future.value(false);
+  return Future.doWhile(() {
+    return (--n > 0) ? ftrue : ffalse;
+  }).then((_) {
+    // Success
+  }, onError: (e, s) {
+    Expect.fail("$e\n$s");
+  });
+}
+
+Future testDoWhileManyValues() {
+  int n = 100000;
+  return Future.doWhile(() {
+    return (--n > 0);
+  }).then((_) {
+    // Success
+  }, onError: (e, s) {
+    Expect.fail("$e\n$s");
+  });
+}
+
 main() {
   List<Future> futures = new List<Future>();
 
@@ -259,10 +283,12 @@ main() {
   futures.add(testDoWhile());
   futures.add(testDoWhileSync());
   futures.add(testDoWhileWithException());
+  futures.add(testDoWhileManyFutures());
+  futures.add(testDoWhileManyValues());
 
   asyncStart();
   Future.wait(futures).then((List list) {
-    Expect.equals(18, list.length);
+    Expect.equals(20, list.length);
     asyncEnd();
   });
 }