Use VM tag in profile and add stack trace trie

runtime/bin/vmservice/client/lib/src/service/service.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;
 
 /// A [ServiceObject] is an object known to the VM service and is tied
 /// to an owning [Isolate].
 abstract class ServiceObject extends Observable {
   Isolate _isolate;
@@ skipping 78 matching lines @@
     return this;
   }
 
   // update internal state from [map]. [map] can be a reference.
   void _update(ObservableMap map);
 
   /// Returns true if [this] has only been partially initialized via
   /// a reference. See [load].
   bool isRef() => _ref;
 
+  // Disabled by default because the logging is excessive.
+  static bool _traceServiceObjectCreation = false;
   void _created() {
-    var refNotice = _ref ? ' Created from reference.' : '';
-    Logger.root.info('Created ServiceObject for \'${_id}\' with type '
-                     '\'${_serviceType}\'.' + refNotice);
+    if (_traceServiceObjectCreation) {
+      var refNotice = _ref ? ' Created from reference.' : '';
+      Logger.root.info('Created ServiceObject for \'${_id}\' with type '
+                       '\'${_serviceType}\'.' + refNotice);
+    }
   }
 
   /// Returns true if [map] is a service map. i.e. it has the following keys:
   /// 'id' and a 'type'.
   static bool isServiceMap(ObservableMap m) {
     return (m != null) && (m['id'] != null) && (m['type'] != null);
   }
 
   /// Returns true if [type] is a reference type. i.e. it begins with an
   /// '@' character.
@@ skipping 71 matching lines @@
       return isolate.codes.putIfAbsent(m);
     case 'Isolate':
       return vm.isolates.getIsolateFromMap(m);
     case 'Class':
       return isolate.classes.putIfAbsent(m);
     case 'Function':
       return isolate.functions.putIfAbsent(m);
   }
   return new ServiceMap.fromMap(isolate, m);
 }