Propagate type inference through variable gets.

pkg/front_end/testcases/inference/propagate_variable_get.dart

Index: pkg/front_end/testcases/inference/propagate_variable_get.dart
diff --git a/pkg/front_end/testcases/inference/propagate_variable_get.dart b/pkg/front_end/testcases/inference/propagate_variable_get.dart
new file mode 100644
index 0000000000000000000000000000000000000000..a110348e53bf138a72dec313ff7b0c63536a9e7f
--- /dev/null
+++ b/pkg/front_end/testcases/inference/propagate_variable_get.dart
@@ -0,0 +1,11 @@
+// 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;
+
+main() {
+  var /*@type=int*/ a = 0;
+  var /*@type=int*/ b = /*@promotedType=none*/ a;
+}