Observatory: Fix allocation profile CVS export. Fix heap snapshot in/out reference counts.

runtime/observatory/lib/src/elements/heap_snapshot.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.
 
 // 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.
 
 import 'dart:async';
 import 'dart:html';
@@ skipping 328 matching lines @@
       element.children[4] = new ClassRefElement(_isolate, item.clazz,
           queue: _r.queue)..classes = ['name'];
     } else if (item is Iterable) {
       element.children[0].text = '';
       if (item.isNotEmpty) {
         element.children[2].text = _tree.isExpanded(item) ? '▼' : '►';
       } else {
         element.children[2].text = '';
       }
       element.children[3].text = '';
+      int references = 0;
+      for (var referenceGroup in item) {
+        references += referenceGroup.count;
+      }
       if (item is Iterable<M.HeapSnapshotClassInbound>) {
         element.children[4] = new SpanElement()..classes = ['name']
-            ..text = '${item.length} Incoming references';
+            ..text = '$references incoming references';
       } else {
         element.children[4] = new SpanElement()..classes = ['name']
-            ..text = '${item.length} Outgoing references';
+            ..text = '$references outgoing references';
       }
     } else {
       element.children[0].text = '';
       element.children[2].text = '';
       element.children[3].text = '';
       element.children[4] = new SpanElement()..classes = ['name'];
       if (item is M.HeapSnapshotClassInbound){
         element.children[3].text =
             '${item.count} references from instances of ';
         element.children[4].children = [
@@ skipping 38 matching lines @@
                 selected: _mode == mode)
               ..text = modeToString(mode);
           }).toList(growable: false)
         ..onChange.listen((_) {
             _mode = HeapSnapshotTreeMode.values[s.selectedIndex];
             _r.dirty();
           })
     ];
   }
 }