Reapply CL: first step for modular support in fasta

pkg/front_end/testcases/shaker/empty_program.dart

Index: pkg/front_end/testcases/shaker/empty_program.dart
diff --git a/pkg/front_end/testcases/shaker/empty_program.dart b/pkg/front_end/testcases/shaker/empty_program.dart
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+// 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.
+
+// An empty program will include some minimal pieces of dart:core and dart:async
+// that today are required by fasta and by the kernel transformers.
+
+// @@SHOW_CORE_LIBRARIES@@ (special comment for the test framework).
+main() {}