Serialize data for LibraryElement.getImportsFor

tests/compiler/dart2js/serialization/helper.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 dart2js.serialization_helper;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:compiler/src/commandline_options.dart';
@@ skipping 135 matching lines @@
   SerializationResult(this.compiler, this.serializedData);
 }
 
 Future<SerializationResult> serialize(Uri entryPoint,
     {Map<String, String> memorySourceFiles: const <String, String>{},
      List<Uri> resolutionInputs: const <Uri>[],
      Uri dataUri}) async {
   if (dataUri == null) {
     dataUri = Uri.parse('memory:${DEFAULT_DATA_FILE_NAME}');
   }
+  OutputCollector outputCollector = new OutputCollector();
   Compiler compiler = compilerFor(
-      options: [Flags.analyzeAll],
+      options: [Flags.resolveOnly],
       memorySourceFiles: memorySourceFiles,
-      resolutionInputs: resolutionInputs);
-  compiler.serialization.supportSerialization = true;
+      resolutionInputs: resolutionInputs,
+      outputProvider: outputCollector);
   await compiler.run(entryPoint);
-  BufferedEventSink sink = new BufferedEventSink();
-  compiler.serialization.serializeToSink(
-      sink, compiler.libraryLoader.libraries);
-  SerializedData serializedData = new SerializedData(dataUri, sink.text);
+  SerializedData serializedData = new SerializedData(
+      dataUri, outputCollector.getOutput('', 'data'));
   return new SerializationResult(compiler, serializedData);
 }
 
 class SerializedData {
   final Uri uri;
   final String data;
 
   SerializedData(this.uri, this.data);
 
   Map<String, String> toMemorySourceFiles([Map<String, String> input]) {
@@ skipping 57 matching lines @@
   await compiler.run(null);
   List<LibraryElement> libraries = <LibraryElement>[];
   for (Uri uri in uriList) {
     libraries.add(compiler.libraryLoader.lookupLibrary(uri));
   }
   SerializedData additionalSerializedData =
       new SerializedData(Uri.parse('memory:additional.data'),
       extractSerializedData(compiler, libraries));
   return <SerializedData>[serializedData, additionalSerializedData];
 }