Fix polymer tests and a couple bugs

pkg/polymer/lib/src/build/import_inliner.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.
 
 /// Transfomer that inlines polymer-element definitions from html imports.
 library polymer.src.build.import_inliner;
 
 import 'dart:async';
 import 'dart:convert';
 
@@ skipping 300 matching lines @@
   String visitInlineDart(String code) {
     var unit = parseCompilationUnit(code);
     var file = new SourceFile.text(spanUrlFor(sourceId, transform), code);
     var output = new TextEditTransaction(code, file);
 
     for (Directive directive in unit.directives) {
       if (directive is UriBasedDirective) {
         var uri = directive.uri.stringValue;
         var span = _getSpan(file, directive.uri);
 
-        var id = resolve(sourceId, uri, transform.logger, span);
+        var id = resolve(sourceId, uri, transform.logger, span,
+            allowAbsolute: true);
         if (id == null) continue;
 
         var primaryId = transform.primaryInput.id;
         var newUri = assetUrlFor(id, primaryId, transform.logger);
         if (newUri != uri) {
           output.edit(span.start.offset, span.end.offset, "'$newUri'");
         }
       }
     }
 
@@ skipping 50 matching lines @@
   'formaction', // in button, input
   'href',       // in a, area, link, base, command
   'icon',       // in command
   'manifest',   // in html
   'poster',     // in video
   'src',        // in audio, embed, iframe, img, input, script, source, track,
                 //    video
 ];
 
 _getSpan(SourceFile file, AstNode node) => file.span(node.offset, node.end);