Provide stdout and stderr output in the Observatory debugger.

runtime/observatory/lib/src/service/object.dart

 // Copyright (c) 2014, 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.
 
 part of service;
 
 /// Helper function for canceling a Future<StreamSubscription>.
 Future cancelFutureSubscription(
     Future<StreamSubscription> subscriptionFuture) async {
   if (subscriptionFuture != null) {
@@ skipping 679 matching lines @@
     return invokeRpc('streamCancel', params);
   }
 
   // A map from stream id to event stream state.
   Map<String,_EventStreamState> _eventStreams = {};
 
   // Well-known stream ids.
   static const kIsolateStream = 'Isolate';
   static const kDebugStream = 'Debug';
   static const kGCStream = 'GC';
+  static const kStdoutStream = 'Stdout';
+  static const kStderrStream = 'Stderr';
   static const _kGraphStream = '_Graph';
 
   /// Returns a single-subscription Stream object for a VM event stream.
   Future<Stream> getEventStream(String streamId) async {
     var eventStream = _eventStreams.putIfAbsent(
         streamId, () => new _EventStreamState(
             this, streamId, () => _eventStreams.remove(streamId)));
     return eventStream.addStream();
   }
 
@@ skipping 908 matching lines @@
 
   @observable String kind;
   @observable Breakpoint breakpoint;
   @observable Frame topFrame;
   @observable Instance exception;
   @observable ServiceObject inspectee;
   @observable ByteData data;
   @observable int count;
   @observable String reason;
   @observable String exceptions;
+  @observable String bytesAsString;
   int chunkIndex, chunkCount, nodeCount;
 
   @observable bool get isPauseEvent {
     return (kind == kPauseStart ||
             kind == kPauseExit ||
             kind == kPauseBreakpoint ||
             kind == kPauseInterrupted ||
             kind == kPauseException);
   }
 
@@ skipping 35 matching lines @@
     if (map['nodeCount'] != null) {
       nodeCount = map['nodeCount'];
     }
     if (map['count'] != null) {
       count = map['count'];
     }
     if (map['_debuggerSettings'] != null &&
         map['_debuggerSettings']['_exceptions'] != null) {
       exceptions = map['_debuggerSettings']['_exceptions'];
     }
+    if (map['bytes'] != null) {
+      var bytes = decodeBase64(map['bytes']);
+      bytesAsString = UTF8.decode(bytes);
+    }
   }
 
   String toString() {
     if (data == null) {
       return "ServiceEvent(owner='${owner.id}', kind='${kind}')";
     } else {
       return "ServiceEvent(owner='${owner.id}', kind='${kind}', "
           "data.lengthInBytes=${data.lengthInBytes})";
     }
   }
@@ skipping 1879 matching lines @@
     var v = list[i];
     if ((v is ObservableMap) && _isServiceMap(v)) {
       list[i] = owner.getFromMap(v);
     } else if (v is ObservableList) {
       _upgradeObservableList(v, owner);
     } else if (v is ObservableMap) {
       _upgradeObservableMap(v, owner);
     }
   }
 }