Refactor emitter in web-ui to make dart.js the last script, also cleanup tests

lib/src/compiler.dart

 // Copyright (c) 2012, 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.
 
 library compiler;
 
 import 'dart:async';
 import 'dart:collection' show SplayTreeMap;
 import 'dart:json' as json;
 import 'package:analyzer_experimental/src/generated/ast.dart' show Directive, UriBasedDirective;
@@ skipping 598 matching lines @@
     var bootstrapOutPath = _pathMapper.outputPath(bootstrapPath, '');
     var bootstrapOutName = path.basename(bootstrapOutPath);
     output.add(new OutputFile(bootstrapOutPath, _bootstrapCode(
           _pathMapper.importUrlFor(new FileInfo(
               new UrlInfo('', bootstrapPath, null)), fileInfo),
           _useObservers)));
 
     var document = file.document;
     var hasCss = _emitAllCss();
     transformMainHtml(document, fileInfo, _pathMapper, hasCss,
-        options.rewriteUrls, _messages);
-
-    document.body.nodes.add(parseFragment(
-        '<script type="application/dart" src="$bootstrapOutName"></script>'));
-
+        options.rewriteUrls, _messages, bootstrapOutName);
     output.add(new OutputFile(_pathMapper.outputPath(file.path, '.html'),
         document.outerHtml, source: file.path));
   }
 
   // TODO(jmesserly): refactor this and other CSS related transforms out of
   // Compiler.
   /**
    * Generate an CSS file for all style sheets (main and components).
    * Returns true if a file was generated, otherwise false.
    */
@@ skipping 183 matching lines @@
 
 main() {
   watcher.useObservers = $useObservers;
   Logger.root.onRecord.listen((record) {
     print('\${record.level.name.toLowerCase()}: \${record.message}');
   });
   userMain.main();
   userMain.init_autogenerated();
 }
 """;