Add a working command line debugger to Observatory.

runtime/observatory/lib/src/elements/service_view.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 service_object_view_element;
 
 import 'dart:html';
 import 'package:logging/logging.dart';
 import 'package:observatory/service.dart';
 import 'package:observatory/tracer.dart';
@@ skipping 158 matching lines @@
       Logger.root.info('Viewing null object.');
       return;
     }
     var type = object.vmType;
     var element = _constructElementForObject();
     if (element == null) {
       Logger.root.info('Unable to find a view element for \'${type}\'');
       return;
     }
     children.add(element);
-    Logger.root.info('Viewing object of \'${type}\'');
   }
 }
 
 @CustomTag('trace-view')
 class TraceViewElement extends ObservatoryElement {
   @published Tracer tracer;
   TraceViewElement.created() : super.created();
 }
 
 @CustomTag('map-viewer')
@@ skipping 36 matching lines @@
 
   dynamic expander() {
     return expandEvent;
   }
 
   void expandEvent(bool exp, var done) {
     expand = exp;
     done();
   }
 }