Roll Observatory packages and add a roll script

packages/polymer/test/element_import/import_b.html

Index: packages/polymer/test/element_import/import_b.html
diff --git a/packages/polymer/test/element_import/import_b.html b/packages/polymer/test/element_import/import_b.html
new file mode 100644
index 0000000000000000000000000000000000000000..045c6072ff950d66ab06c0a061aec296f21b7bdf
--- /dev/null
+++ b/packages/polymer/test/element_import/import_b.html
@@ -0,0 +1,16 @@
+<!--
+    @license
+    Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+    This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+    The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+    The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+    Code distributed by Google as part of the polymer project is also
+    subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+<link rel="import" href="../packages/polymer/polymer.html">
+<polymer-element name="x-bar">
+  <template>
+    x-bar
+  </template>
+  <script type="application/dart" src="import_b.dart"></script>
+</polymer-element>