Roll Observatory packages and add a roll script

packages/code_transformers/.status

+# Copyright (c) 2014, 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.
+
+# Don't run any test-like files that show up in packages directories. It
+# shouldn't be necessary to run "pub install" in these packages, but if you do
+# it shouldn't break the tests.
+*/packages/*/*: Skip
+*/*/packages/*/*: Skip
+*/*/*/packages/*/*: Skip
+*/*/*/*/packages/*/*: Skip
+*/*/*/*/*/packages/*/*: Skip
+
+build/*: Skip  # nothing requires pub-build
+
+[ $runtime == vm && $mode == debug]
+test/resolver_test: Skip  # Times out
+
+[ $runtime == vm && ( $arch == simarm || $arch == simmips ) ]
+test/resolver_test: Skip # Issue 17908
+
+[ $compiler == dart2js ]
+test/unique_message_test: Skip # Intended only as a vm test.
+
+[ $browser ]
+test/assets_test: Skip # Uses dart:io
+test/entry_point_test: Skip # Uses dart:io
+test/resolver_test: Skip # Uses dart:io
+test/unique_message_test: Skip # Uses dart:io
+test/remove_sourcemap_comment_test: Skip # Uses dart:io.
+test/benchmarks_test: Skip # Uses dart:io.