Add KernelCodegenWorkItem stub

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:io';
 import 'dart:math' as math;
 import 'dart:typed_data';
@@ skipping 188 matching lines @@
     } else {
       throw 'Unknown kind: $kind (${kind.ordinal})';
     }
     if (!enableColors) {
       color = (x) => x;
     }
     if (uri == null) {
       print('${color(message)}');
     } else {
       SourceFile file = provider.sourceFiles[uri];
-      if (file != null) {
+      // TODO(johnniwinther): Remove the '.dill' hack; add support for binary
+      // files to avoid crashes on trying to decode .dill binaries as utf8.
+      if (file != null && !file.filename.endsWith('.dill')) {

[Siggi Cherem (dart-lang), 2017/05/19 20:09:50]

eeek! but ok, I guess... 

         print(file.getLocationMessage(color(message), begin, end,
             colorize: color));
       } else {
         String position = end - begin > 0 ? '@$begin+${end - begin}' : '';
         print('${provider.relativizeUri(uri)}$position:\n'
             '${color(message)}');
       }
     }
     if (fatal && ++fatalCount >= throwOnErrorCount && throwOnError) {
       isAborting = true;
@@ skipping 196 matching lines @@
           resolvedUri = file;
           break;
         }
       }
     }
     List<int> result = await readUtf8BytesFromUri(resolvedUri);
     sourceFiles[uri] = sourceFiles[resolvedUri];
     return result;
   }
 }