Redo LocationManager to use HTML5 History API

runtime/bin/vmservice/client/lib/src/elements/nav_bar.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 nav_bar_element;
 
 import 'dart:html';
 import 'observatory_element.dart';
+import 'package:observatory/app.dart';
 import 'package:observatory/service.dart';
 import 'package:polymer/polymer.dart';
 
 
 @CustomTag('nav-bar')
 class NavBarElement extends ObservatoryElement {
   @published bool pad = true;
 
   NavBarElement.created() : super.created();
 }
@@ skipping 31 matching lines @@
     if (callback != null) {
       callback(refreshDone);
     }
   }
 
   void refreshDone() {
     active = false;
   }
 }
 
+@CustomTag('nav-control')
+class NavControlElement extends ObservatoryElement {
+  NavControlElement.created() : super.created();
+
+  void forward(Event e, var detail, Element target) {
+    location.forward();
+  }
+
+  void back(Event e, var detail, Element target) {
+    location.back();
+  }
+}
+
 @CustomTag('top-nav-menu')
 class TopNavMenuElement extends ObservatoryElement {
   @published bool last = false;
 
   TopNavMenuElement.created() : super.created();
 }
 
 @CustomTag('isolate-nav-menu')
 class IsolateNavMenuElement extends ObservatoryElement {
   @published bool last = false;
   @published Isolate isolate;
 
   void isolateChanged(oldValue) {
     notifyPropertyChange(#hashLinkWorkaround, 0, 1);
   }
 
   // TODO(turnidge): Figure out why polymer needs this function.
   @reflectable
   String get hashLinkWorkaround {
     if (isolate != null) {
-      return isolate.hashLink;
+      return isolate.link;
     } else {
       return '';
     }
   }
   @reflectable set hashLinkWorkaround(var x) { /* silence polymer */ }
 
   IsolateNavMenuElement.created() : super.created();
 }
 
 @CustomTag('library-nav-menu')
 class LibraryNavMenuElement extends ObservatoryElement {
   @published Library library;
   @published bool last = false;
 
   LibraryNavMenuElement.created() : super.created();
 }
 
 @CustomTag('class-nav-menu')
 class ClassNavMenuElement extends ObservatoryElement {
   @published ServiceMap cls;
   @published bool last = false;
 
   ClassNavMenuElement.created() : super.created();
 }