Modify scanner and parser to be standalone packages.

pkg/dart_scanner/lib/src/main.dart

Index: pkg/dart_scanner/lib/src/main.dart
diff --git a/pkg/dart_scanner/lib/src/main.dart b/pkg/dart_scanner/lib/src/main.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c99385333a76046b0ec1449635dcef46913bb2bf
--- /dev/null
+++ b/pkg/dart_scanner/lib/src/main.dart
@@ -0,0 +1,34 @@
+// 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.
+
+import '../io.dart' show
+    readBytesFromFileSync;
+
+import '../scanner.dart' show
+    scan;
+
+scanAll(Map<Uri, List<int>> files) {
+  Stopwatch sw = new Stopwatch()..start();
+  int byteCount = 0;
+  files.forEach((Uri uri, List<int> bytes) {
+    scan(bytes);
+    byteCount += bytes.length - 1;
+  });
+  sw.stop();
+  print("Scanning files took: ${sw.elapsed}");
+  print("Bytes/ms: ${byteCount/sw.elapsedMilliseconds}");
+}
+
+main(List<String> arguments) {
+  Map<Uri, List<int>> files = <Uri, List<int>>{};
+  Stopwatch sw = new Stopwatch()..start();
+  for (String name in arguments) {
+    Uri uri = Uri.base.resolve(name);
+    List<int> bytes = readBytesFromFileSync(uri);
+    files[uri] = bytes;
+  }
+  sw.stop();
+  print("Reading files took: ${sw.elapsed}");
+  scanAll(files);
+}