Infer types of double literals.

pkg/front_end/testcases/inference/simple_literal_int.dart

Index: pkg/front_end/testcases/inference/simple_literal_int.dart
diff --git a/pkg/front_end/testcases/inference/simple_literal_int.dart b/pkg/front_end/testcases/inference/simple_literal_int.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c3ae42f4fc6b097f97d987b13649d83281164cb2
--- /dev/null
+++ b/pkg/front_end/testcases/inference/simple_literal_int.dart
@@ -0,0 +1,12 @@
+// 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.md file.
+
+/*@testedFeatures=inference*/
+library test;
+
+var /*@topType=int*/ a = 1;
+
+main() {
+  var /*@type=int*/ b = 2;
+}