Add deferred map info to dump-info.

pkg/compiler/lib/src/dump_info.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 dump_info;
 
 import 'dart:convert' show
     HtmlEscape,
     JsonEncoder,
     StringConversionSink,
@@ skipping 621 matching lines @@
         'name': outputUnit.name,
         'size': backend.emitter.oldEmitter.outputBuffers[outputUnit].length,
       });
     }
 
     Map<String, dynamic> outJson = {
       'elements': infoCollector.toJson(),
       'holding': holding,
       'outputUnits': outputUnits,
       'dump_version': 3,
+      'deferredFiles': compiler.deferredLoadTask.computeDeferredMap(),
+      // This increases when new information is added to the map, but the viewer
+      // still is compatible.
+      'dump_minor_version': '1'
     };
 
     Duration toJsonDuration = new DateTime.now().difference(startToJsonTime);
 
     Map<String, dynamic> generalProgramInfo = <String, dynamic> {
       'size': _programSize,
       'dart2jsVersion': infoCollector.dart2jsVersion,
       'compilationMoment': new DateTime.now().toString(),
       'compilationDuration': compiler.totalCompileTime.elapsed.toString(),
       'toJsonDuration': 0,
       'dumpInfoDuration': this.timing.toString(),
       'noSuchMethodEnabled': compiler.enabledNoSuchMethod
     };
 
     outJson['program'] = generalProgramInfo;
 
     ChunkedConversionSink<Object> sink =
       encoder.startChunkedConversion(
           new StringConversionSink.fromStringSink(buffer));
     sink.add(outJson);
     compiler.reportInfo(NO_LOCATION_SPANNABLE,
         const MessageKind(
             "View the dumped .info.json file at "
             "https://dart-lang.github.io/dump-info-visualizer"));
   }
 }