Change dart2js.dart to use compiler_new.dart

pkg/compiler/lib/src/source_file_provider.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.
 
 library source_file_provider;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:math' as math;
@@ skipping 220 matching lines @@
 
   // TODO(johnniwinther): Remove this when no longer needed for the old compiler
   // API.
   void call(Uri uri, int begin, int end, String message, api.Diagnostic kind) {
     return report(null, uri, begin, end, message, kind);
   }
 }
 
 typedef void MessageCallback(String message);
 
-class RandomAccessFileOutputProvider {
+class RandomAccessFileOutputProvider implements CompilerOutput {
   final Uri out;
   final Uri sourceMapOut;
   final MessageCallback onInfo;
   final MessageCallback onFailure;
 
   int totalCharactersWritten = 0;
   List<String> allOutputFiles = new List<String>();
 
   RandomAccessFileOutputProvider(this.out, this.sourceMapOut,
       {this.onInfo, this.onFailure});
 
   static Uri computePrecompiledUri(Uri out) {
     String extension = 'precompiled.js';
     String outPath = out.path;
     if (outPath.endsWith('.js')) {
       outPath = outPath.substring(0, outPath.length - 3);
       return out.resolve('$outPath.$extension');
     } else {
       return out.resolve(extension);
     }
   }
 
   EventSink<String> call(String name, String extension) {
+    return createEventSink(name, extension);
+  }
+  
+  EventSink<String> createEventSink(String name, String extension) {
     Uri uri;
     bool isPrimaryOutput = false;
     // TODO (johnniwinther, sigurdm): Make a better interface for
     // output-providers.
     if (extension == "deferred_map") {
       uri = out.resolve(name);
     } else if (name == '') {
       if (extension == 'js' || extension == 'dart') {
         isPrimaryOutput = true;
         uri = out;
@@ skipping 56 matching lines @@
   var onAdd, onClose;
 
   EventSinkWrapper(this.onAdd, this.onClose);
 
   void add(String data) => onAdd(data);
 
   void addError(error, [StackTrace stackTrace]) => throw error;
 
   void close() => onClose();
 }