Fix for CSS URIs not parsing correctly with innerHTML

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 129d2d928944bbf2b0a3c4d0ad407a6a37f5bfb1..b1fdab9d5c6b52008c8529e4bb2c88958f480150 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -9688,6 +9688,11 @@ abstract class Element extends Node implements ParentNode, ChildNode native "Ele
     if (_parseDocument == null) {
       _parseDocument = document.implementation.createHtmlDocument('');
       _parseRange = _parseDocument.createRange();
+
+      // Workaround for Chrome bug 229142- URIs are not resolved in new doc.
+      var base = _parseDocument.$dom_createElement('base');
+      base.href = document._baseUri;
+      _parseDocument.head.append(base);
     }
     var contextElement;
     if (this is BodyElement) {
@@ -17785,6 +17790,11 @@ class Node extends EventTarget native "Node" {
   @DocsEditable()
   static const int TEXT_NODE = 3;
 
+  @JSName('baseURI')
+  @DomName('Node.baseURI')
+  @DocsEditable()
+  final String _baseUri;
+
   @DomName('Node.childNodes')
   @DocsEditable()
   @deprecated