Add observatory_pub_packages snapshot to third_party

observatory_pub_packages/polymer/polymer.html

Index: observatory_pub_packages/polymer/polymer.html
===================================================================
--- observatory_pub_packages/polymer/polymer.html	(revision 0)
+++ observatory_pub_packages/polymer/polymer.html	(working copy)
@@ -0,0 +1,21 @@
+<!--
+ Copyright 2013 The Polymer Authors. All rights reserved.
+ Use of this source code is governed by a BSD-style
+ license that can be found in the LICENSE file.
+-->
+
+<!--
+This file is from the Polymer project (https://github.com/Polymer/polymer/).
+You can replace polymer.html with a different version if desired.
+-->
+<!-- minified for deployment: -->
+<link rel="import" href="src/js/polymer/polymer.html">
+<script>
+// TODO(sigmund): remove this script tag (dartbug.com/19650). This empty
+// script tag is necessary to work around a bug in Chrome 36.
+</script>
+
+<!-- unminified for debugging:
+<link rel="import" href="src/js/polymer/layout.html">
+<script src="src/js/polymer/polymer.js"></script>
+-->