Roll Observatory packages and add a roll script

packages/polymer/lib/src/build/log_injector.dart

 // Copyright (c) 2013, 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.
 
 /// This library provides a single function called injectLogs which when called
 /// will request a logs json file and build a small widget out of them which
 /// groups the logs by level.
 library polymer.build.log_injector;
 
 import 'dart:async';
@@ skipping 108 matching lines @@
     });
 
     document.body.append(wrapperDiv);
   }
 }
 
 final _urlRegex = new RegExp('http://[^ ]*');
 class _OpenUriPolicy implements UriPolicy {
   bool allowsUri(String uri) => true;
 }