Modify scanner and parser to be standalone packages.

pkg/dart_scanner/testing.json

Index: pkg/dart_scanner/testing.json
diff --git a/pkg/dart_scanner/testing.json b/pkg/dart_scanner/testing.json
new file mode 100644
index 0000000000000000000000000000000000000000..9b3305161df1ff4bf7f0803ef0efff914609024f
--- /dev/null
+++ b/pkg/dart_scanner/testing.json
@@ -0,0 +1,28 @@
+{
+"":"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.md file.",
+  "suites": [
+    {
+      "name": "scanner",
+      "kind": "Chain",
+      "source": "test/scanner_suite.dart",
+      "path": "../../",
+      "status": "test/scanner.status",
+      "pattern": [
+        "\\.dart$"
+      ],
+      "exclude": [
+      ]
+    }
+  ],
+  "analyze": {
+    "uris": [
+      "lib/",
+      "lib/src/",
+      "bin/"
+    ],
+    "exclude": [
+    ]
+  }
+}