Updates dartc to recognize 'default' keyword on interface and updated factory method syntax

compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java

 // Copyright (c) 2011, 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.
 
 package com.google.dart.compiler.backend.js;
 
 import com.google.common.base.Strings;
 import com.google.dart.compiler.CommandLineOptions.CompilerOptions;
 import com.google.dart.compiler.CompilerConfiguration;
 import com.google.dart.compiler.CompilerTestCase;
@@ skipping 35 matching lines @@
   }
 
   protected String compileSingleUnit(final String filePath, final String part) throws IOException {
     URL url = inputUrlFor(getClass(), filePath + ".dart");
     String source = readUrl(url);
     MockLibrarySource lib = new MockLibrarySource();
     DartSourceTest src = new DartSourceTest(filePath, source, lib);
     lib.addSource(src);
     CompilerOptions options = new CompilerOptions();
     CompilerConfiguration config = new DefaultCompilerConfiguration(this.getBackend(), options);
-    DartCompilerListener listener = new DartCompilerListenerTest(src.getName());
+    DartCompilerListenerTest listener = new DartCompilerListenerTest(src.getName());
     DartCompiler.compileLib(lib, config, provider, listener);
-
+    listener.checkAllErrorsReported();
     return provider.getArtifactString(src, part, JavascriptBackend.EXTENSION_JS);
   }
 
   protected List<String> findMarkerLines(String js) {
     assertNotNull(js);
     List<String> lines = new ArrayList<String>();
 
     int begin = 0;
     int end = 0;
     while (true) {
@@ skipping 82 matching lines @@
     assert end >= start;
     List<String> result = new ArrayList<String>();
     for (String s : corpus.substring(start, end).split("\\n")) {
       if (s.equals("{") || s.equals("}"))
         continue;
       result.add(s.trim());
     }
     return result.toArray(new String[0]);
   }
 }