Support per-library serialization.

tests/compiler/dart2js/serialization_analysis_test.dart

 // Copyright (c) 2015, 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_analysis_test;
 
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 import 'package:compiler/src/commandline_options.dart';
@@ skipping 224 matching lines @@
 
 Future analyze(String serializedData, Uri entryPoint, Test test) async {
   DiagnosticCollector diagnosticCollector = new DiagnosticCollector();
   await runCompiler(
       entryPoint: entryPoint,
       memorySourceFiles: test != null ? test.sourceFiles : const {},
       options: [Flags.analyzeOnly],
       diagnosticHandler: diagnosticCollector,
       beforeRun: (Compiler compiler) {
         Deserializer deserializer = new Deserializer.fromText(
+            new DeserializationContext(),
             serializedData,
             const JsonSerializationDecoder());
         deserializer.plugins.add(compiler.backend.serialization.deserializer);
         compiler.serialization.deserializer =
             new _DeserializerSystem(deserializer);
       });
   if (test != null) {
     Expect.equals(test.expectedErrorCount, diagnosticCollector.errors.length,
         "Unexpected error count.");
     Expect.equals(
         test.expectedWarningCount,
         diagnosticCollector.warnings.length,
         "Unexpected warning count.");
     Expect.equals(test.expectedHintCount, diagnosticCollector.hints.length,
         "Unexpected hint count.");
     Expect.equals(test.expectedInfoCount, diagnosticCollector.infos.length,
         "Unexpected info count.");
   }
 }
 
 Future<String> serializeDartCore() async {
   Compiler compiler = compilerFor(
       options: [Flags.analyzeAll]);
   compiler.serialization.supportSerialization = true;
   await compiler.run(Uris.dart_core);
   return serialize(compiler);
 }
 
 String serialize(Compiler compiler) {
-  Serializer serializer = new Serializer(const JsonSerializationEncoder());
+  Serializer serializer = new Serializer();
   serializer.plugins.add(compiler.backend.serialization.serializer);
   serializer.plugins.add(new WorldImpactSerializer(compiler.resolution));
 
   for (LibraryElement library in compiler.libraryLoader.libraries) {
     serializer.serialize(library);
   }
-  return serializer.toText();
+  return serializer.toText(const JsonSerializationEncoder());
 }
 
 const String WORLD_IMPACT_TAG = 'worldImpact';
 
 class WorldImpactSerializer extends SerializerPlugin {
   final Resolution resolution;
 
   WorldImpactSerializer(this.resolution);
 
   @override
@@ skipping 44 matching lines @@
       impact = const WorldImpact();
     }
     return impact;
   }
 
   @override
   bool isDeserialized(Element element) {
     return deserializedLibraries.contains(element.library);
   }
 }