Build fixes: adds arguments to the pub-build plugin to configure whether 'js'

pkg/polymer/lib/src/build/script_compactor.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 combines multiple dart script tags into a single one. */
 library polymer.src.build.script_compactor;
 
 import 'dart:async';
 import 'dart:convert';
 
@@ skipping 63 matching lines @@
         if (mainScriptTag == null) {
           // We didn't find any main library, nothing to do.
           transform.addOutput(transform.primaryInput);
           return;
         }
 
         var bootstrapId = id.addExtension('_bootstrap.dart');
         mainScriptTag.attributes['src'] = 
             path.url.basename(bootstrapId.path);
 
-        libraries.add(mainLibraryId);
+        // TODO(sigmund): stop renaming the file (see dartbug.com/14554)
+        var modifiedMainId = mainLibraryId.addExtension('_modified.dart');
+
+        libraries.add(modifiedMainId);
         var urls = libraries.map((id) => assetUrlFor(id, bootstrapId, logger))
             .where((url) => url != null).toList();
         var buffer = new StringBuffer()..writeln(MAIN_HEADER);
         int i = 0;
         for (; i < urls.length; i++) {
           buffer.writeln("import '${urls[i]}' as i$i;");
         }
 
         buffer..write('\n')
             ..writeln('void main() {')
             ..writeln('  configureForDeployment([')
             ..writeAll(urls.map((url) => "      '$url',\n"))
             ..writeln('    ]);')
-            ..writeln('  i${i - 1}.main();')
+            ..writeln('  i${i - 1}.polymerMainWrapper();')
             ..writeln('}');
 
         transform.addOutput(new Asset.fromString(
               bootstrapId, buffer.toString()));
         transform.addOutput(new Asset.fromString(id, document.outerHtml));
+
+        return transform.readInputAsString(mainLibraryId).then((contents) {
+          transform.addOutput(new Asset.fromString(modifiedMainId,
+              '$contents\n\npolymerMainWrapper() => main();\n'));
+        });
       });
     });
   }
 }
 
 const MAIN_HEADER = """
 library app_bootstrap;
 
 import 'package:polymer/polymer.dart';
 """;