Build shadow_dom package in dart/pkg

pkg/shadow_dom/tool/shadowdom.js

Index: pkg/shadow_dom/tool/shadowdom.js
diff --git a/pkg/shadow_dom/tool/shadowdom.js b/pkg/shadow_dom/tool/shadowdom.js
new file mode 100644
index 0000000000000000000000000000000000000000..91f58197c17ce457e6b9186c7eb32269f23aa410
--- /dev/null
+++ b/pkg/shadow_dom/tool/shadowdom.js
@@ -0,0 +1,44 @@
+// Copyright 2013 The Polymer Authors. All rights reserved.
+// Use of this source code is goverened by a BSD-style
+// license that can be found in the LICENSE file.
+
+(function() {
+  var thisFile = 'shadowdom.js';
+  var base = '';
+  Array.prototype.forEach.call(document.querySelectorAll('script[src]'), function(s) {
+    var src = s.getAttribute('src');
+    var re = new RegExp(thisFile + '[^\\\\]*');
+    var match = src.match(re);
+    if (match) {
+      base = src.slice(0, -match[0].length);
+    }
+  });
+  base += '../../../third_party/polymer/ShadowDOM/src/';
+
+  [
+    'sidetable.js',
+    'wrappers.js',
+    'wrappers/events.js',
+    'wrappers/NodeList.js',
+    'wrappers/Node.js',
+    'querySelector.js',
+    'wrappers/node-interfaces.js',
+    'wrappers/CharacterData.js',
+    'wrappers/Element.js',
+    'wrappers/HTMLElement.js',
+    'wrappers/HTMLContentElement.js',
+    'wrappers/HTMLShadowElement.js',
+    'wrappers/HTMLTemplateElement.js',
+    'wrappers/HTMLUnknownElement.js',
+    'wrappers/generic.js',
+    'wrappers/ShadowRoot.js',
+    'ShadowRenderer.js',
+    'wrappers/Document.js',
+    'wrappers/Window.js',
+    'wrappers/MutationObserver.js',
+    'wrappers/override-constructors.js'
+  ].forEach(function(src) {
+    document.write('<script src="' + base + src + '"></script>');
+  });
+
+})();