Implement first version of proto lite shrinker.

Bug:
Change-Id: Ia77e68cfd634f38954cdcbe1537fd86937ff9720
diff --git a/src/test/examples/simpleproto1/simple.proto b/src/test/examples/simpleproto1/simple.proto
new file mode 100644
index 0000000..f4e1be4
--- /dev/null
+++ b/src/test/examples/simpleproto1/simple.proto
@@ -0,0 +1,14 @@
+// Copyright (c) 2016, the R8 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.
+syntax = "proto2";
+package simpleproto1;
+
+option java_outer_classname = "GeneratedSimpleProto";
+
+message Simple {
+  required int32 id = 1;
+  required float unusedRequired = 2;
+  optional bool other = 3;
+}
+