Fix type inference of redirecting factory constructor invocations.

pkg/front_end/testcases/inference/constructors_infer_from_arguments_redirecting_factory_to_factory.dart

Index: pkg/front_end/testcases/inference/constructors_infer_from_arguments_redirecting_factory_to_factory.dart
diff --git a/pkg/front_end/testcases/inference/constructors_infer_from_arguments_redirecting_factory_to_factory.dart b/pkg/front_end/testcases/inference/constructors_infer_from_arguments_redirecting_factory_to_factory.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b9337fae1fb7fc31fea25228490b6e08907945e0
--- /dev/null
+++ b/pkg/front_end/testcases/inference/constructors_infer_from_arguments_redirecting_factory_to_factory.dart
@@ -0,0 +1,23 @@
+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/*@testedFeatures=inference*/
+library test;
+
+abstract class C<T> {
+  T get t;
+  void set t(T x);
+
+  factory C(T t) = CImpl<T>;
+}
+
+class CImpl<T> implements C<T> {
+  T t;
+  CImpl._(this.t);
+  factory CImpl(T t) => new /*@typeArgs=CImpl::•::T*/ CImpl._(t);
+}
+
+main() {
+  var /*@type=C<int>*/ x = new /*@typeArgs=int*/ C(42);
+}