Redo LocationManager to use HTML5 History API

runtime/bin/vmservice/client/lib/src/elements/heap_map.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.
 
 library heap_map_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:math';
 import 'observatory_element.dart';
@@ skipping 74 matching lines @@
   }
 
   void _addClass(int classId, String name, Iterable<int> color) {
     _classIdToName[classId] = name.split('@')[0];
     _classIdToColor[classId] = color;
     _colorToClassId[_packColor(color)] = classId;
   }
 
   void _updateClassList(classList, int freeClassId) {
     for (var member in classList['members']) {
-      if (member['type'] != '@Class') {
+      if (member is! Class) {
         Logger.root.info('$member');
         continue;
       }
-      var classId = int.parse(member['id'].split('/').last);
+      var classId = int.parse(member.id.split('/').last);
       var color = _classIdToRGBA(classId);
-      _addClass(classId, member['name'], color);
+      _addClass(classId, member.name, color);
     }
     _addClass(freeClassId, 'Free', _freeColor);
     _addClass(0, '', _pageSeparationColor);
   }
 
   Iterable<int> _classIdToRGBA(int classId) {
     // TODO(koda): Pick random hue, but fixed saturation and value.
     var rng = new Random(classId);
     return [rng.nextInt(128), rng.nextInt(128), rng.nextInt(128), 255];
   }
@@ skipping 29 matching lines @@
                           pageOffset * fragmentation['unit_size_bytes'],
         size * fragmentation['unit_size_bytes']);
   }
 
   void _handleMouseMove(MouseEvent event) {
     var info = _objectAt(event.offset);
     var addressString = '${info.size}B @ 0x${info.address.toRadixString(16)}';
     var className = _classNameAt(event.offset);
     status = (className == '') ? '-' : '$className $addressString';
   }
-  
+
   void _handleClick(MouseEvent event) {
     var address = _objectAt(event.offset).address.toRadixString(16);
     window.location.hash = "/${fragmentation.isolate.link}/address/$address";
   }
 
   void _updateFragmentationData() {
     if (fragmentation == null || _fragmentationCanvas == null) {
       return;
     }
     _updateClassList(
@@ skipping 56 matching lines @@
     }).whenComplete(done);
   }
 
   void fragmentationChanged(oldValue) {
     // Async, in case enteredView has not yet run (observed in JS version).
     new Future(() {
       _updateFragmentationData();
     });
   }
 }