Prepare for development branch by updating externally-used API.

pkg/front_end/lib/src/fasta/kernel/kernel_target.dart

 // Copyright (c) 2016, 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 fasta.kernel_target;
 
 import 'dart:async' show Future;
 
 import 'dart:io' show File;
 
@@ skipping 115 matching lines @@
   SourceLoader<Library> createLoader() =>
       new SourceLoader<Library>(fileSystem, this);
 
   void addSourceInformation(
       Uri uri, List<int> lineStarts, List<int> sourceCode) {
     String fileUri = relativizeUri(uri);
     uriToSource[fileUri] = new Source(lineStarts, sourceCode);
   }
 
   void read(Uri uri) {
-    loader.read(uri);
+    loader.read(uri, -1);
   }
 
   LibraryBuilder createLibraryBuilder(Uri uri, Uri fileUri) {
     if (dillTarget.isLoaded) {
       var builder = dillTarget.loader.builders[uri];
       if (builder != null) {
         return builder;
       }
     }
     return new KernelLibraryBuilder(uri, fileUri, loader);
@@ skipping 566 matching lines @@
   }
   for (Constructor constructor in superclass.constructors) {
     if (constructor.name.name.isEmpty) {
       return constructor.function.requiredParameterCount == 0
           ? constructor
           : null;
     }
   }
   return null;
 }