Roll Observatory packages and add a roll script

packages/csslib/test/debug_test.dart

Index: packages/csslib/test/debug_test.dart
diff --git a/packages/csslib/test/debug_test.dart b/packages/csslib/test/debug_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..94898eb2917470456678b7c71eea48b8e06a9dc5
--- /dev/null
+++ b/packages/csslib/test/debug_test.dart
@@ -0,0 +1,30 @@
+library debug;
+
+import 'package:test/test.dart';
+import 'testing.dart';
+
+void main() {
+  test("excercise debug", () {
+    var style = parseCss(_input);
+
+    var debugValue = style.toDebugString();
+    expect(debugValue, isNotNull);
+
+    var style2 = style.clone();
+
+    expect(style2.toDebugString(), debugValue);
+  });
+}
+
+const String _input = r'''
+.foo {
+background-color: #191919;
+width: 10PX;
+height: 22mM !important;
+border-width: 20cm;
+margin-width: 33%;
+border-height: 30EM;
+width: .6in;
+length: 1.2in;
+-web-stuff: -10Px;
+}''';