Converted Observatory json-view element

runtime/observatory/lib/src/app/application.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.
 
 part of app;
 
 /// The observatory application. Instances of this are created and owned
 /// by the observatory_application custom element.
 class ObservatoryApplication extends Observable {
   static ObservatoryApplication app;
@@ skipping 55 matching lines @@
     if (_gcSubscription == null) {
       return;
     }
     _gcSubscription.cancel();
     _gcSubscription = null;
   }
 
 
   @reflectable final ObservatoryApplicationElement rootElement;
 
-  TraceViewElement _traceView = null;
-
   @reflectable ServiceObject lastErrorOrException;
 
   void _initOnce() {
     assert(app == null);
     app = this;
     _registerPages();
     Analytics.initialize();
     // Visit the current page.
     locationManager._visit();
   }
@@ skipping 44 matching lines @@
       var traceArg = internalArguments['trace'];
       if (traceArg == 'on') {
         Tracer.start();
       } else if (traceArg == 'off') {
         Tracer.stop();
       }
     }
     if (Tracer.current != null) {
       Tracer.current.reset();
     }
-    if (_traceView != null) {
-      _traceView.tracer = Tracer.current;
-    }
     for (var i = 0; i < _pageRegistry.length; i++) {
       var page = _pageRegistry[i];
       if (page.canVisit(uri)) {
         _installPage(page);
         page.visit(uri, internalArguments);
         return;
       }
     }
     throw new FallThroughError();
   }
@@ skipping 13 matching lines @@
     }
     Logger.root.info('Installing page: $page');
     try {
       page.onInstall();
     } catch (e) {
       Logger.root.severe('Failed to install page: $e');
     }
     // Add new page.
     rootElement.children.add(page.element);
 
-    // Add tracing support.
-    _traceView = new Element.tag('trace-view');
-    _traceView.tracer = Tracer.current;
-    rootElement.children.add(_traceView);
-
     // Remember page.
     currentPage = page;
   }
 
   ObservatoryApplication(this.rootElement) {
     _locationManager = new LocationManager(this);
     targets.onChange.listen((e) {
       if (targets.current == null) return _setVM(null);
       if ((_vm as WebSocketVM)?.target != targets.current) {
         _setVM(new WebSocketVM(targets.current));
@@ skipping 34 matching lines @@
     }
 
     // TODO(turnidge): Report this failure via analytics.
     Logger.root.warning('Caught exception: ${e}\n${st}');
     notifications.add(new ExceptionNotification(e, stacktrace: st));
   }
 
   // This map keeps track of which curly-blocks have been expanded by the user.
   Map<String,bool> expansions = {};
 }