Tweak public APIs and use them in patch_sdk, dart2js, and kernel-service

pkg/front_end/test/incremental_kernel_generator_test.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 
 import 'package:front_end/compiler_options.dart';
 import 'package:front_end/incremental_kernel_generator.dart';
 import 'package:front_end/memory_file_system.dart';
+import 'package:front_end/src/fasta/kernel/utils.dart';
 import 'package:front_end/src/incremental/byte_store.dart';
 import 'package:front_end/src/incremental_kernel_generator_impl.dart';
 import 'package:kernel/ast.dart';
 import 'package:kernel/binary/ast_from_binary.dart';
-import 'package:kernel/binary/limited_ast_to_binary.dart';
 import 'package:kernel/text/ast_to_text.dart';
 import 'package:kernel/verifier.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'src/incremental/mock_sdk.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(IncrementalKernelGeneratorTest);
@@ skipping 474 matching lines @@
 ''');
 
     Program program = await getInitialState(bUri);
 
     String initialKernelText;
     List<int> bytes;
     {
       Library initialLibrary = _getLibrary(program, bUri);
       initialKernelText = _getLibraryText(initialLibrary);
 
-      var byteSink = new ByteSink();
-      var printer = new LimitedBinaryPrinter(
-          byteSink, (library) => library.importUri == bUri);
-      printer.writeProgramFile(program);
-      bytes = byteSink.builder.takeBytes();
+      bytes = serializeProgram(program,
+          filter: (library) => library.importUri == bUri);
 
       // Remove b.dart from the program.
       // So, the program is now ready for re-adding the library.
       program.mainMethod = null;
       program.libraries.remove(initialLibrary);
       program.root.removeChild(initialLibrary.importUri.toString());
     }
 
     // Load b.dart from bytes using the initial name root, so that
     // serialized canonical names can be linked to corresponding nodes.
@@ skipping 350 matching lines @@
     throw fail('No library found with URI "$uri"');
   }
 
   String _getLibraryText(Library library) {
     StringBuffer buffer = new StringBuffer();
     new Printer(buffer, syntheticNames: new NameSystem())
         .writeLibraryFile(library);
     return buffer.toString();
   }
 }