Add Fasta tests.

pkg/fasta/test/implicit_this.dart

Index: pkg/fasta/test/implicit_this.dart
diff --git a/pkg/fasta/test/implicit_this.dart b/pkg/fasta/test/implicit_this.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ed2a43534e93ad78e4eac50bb3f87de72ca968df
--- /dev/null
+++ b/pkg/fasta/test/implicit_this.dart
@@ -0,0 +1,24 @@
+// Copyright (c) 2016, 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.
+
+class C {
+  m() {
+    print("Called m");
+  }
+
+  testC() {
+    m();
+  }
+}
+
+class D extends C {
+  testD() {
+    m();
+  }
+}
+
+main() {
+  new C().testC();
+  new D().testD();
+}