Begin migrating the vm service from a rest-style interface to a json-rpc style interface.

runtime/observatory/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 48 matching lines @@
   var _classIdToName = {};
 
   static final _freeColor = [255, 255, 255, 255];
   static final _pageSeparationColor = [0, 0, 0, 255];
   static const _PAGE_SEPARATION_HEIGHT = 4;
   // Many browsers will not display a very tall canvas.
   // TODO(koda): Improve interface for huge heaps.
   static const _MAX_CANVAS_HEIGHT = 6000;
 
   @observable String status;
-  @published ServiceMap fragmentation;
+  @published Isolate isolate;
+  @observable ServiceMap fragmentation;
 
   HeapMapElement.created() : super.created() {
   }
 
   @override
   void attached() {
     super.attached();
     _fragmentationCanvas = shadowRoot.querySelector("#fragmentation");
     _fragmentationCanvas.onMouseMove.listen(_handleMouseMove);
     _fragmentationCanvas.onMouseDown.listen(_handleClick);
@@ skipping 10 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 is! Class) {
-        Logger.root.info('$member');
+        // TODO(turnidge): The printing for some of these non-class
+        // members is broken.  Fix this:
+        //
+        // Logger.root.info('$member');
+        Logger.root.info('Ignoring non-class in class list');
         continue;
       }
       var classId = int.parse(member.id.split('/').last);
       var color = _classIdToRGBA(classId);
       _addClass(classId, member.name, color);
     }
     _addClass(freeClassId, 'Free', _freeColor);
     _addClass(0, '', _pageSeparationColor);
   }
 
@@ skipping 38 matching lines @@
   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);
     app.locationManager.go(app.locationManager.makeLink(
-        "${fragmentation.isolate.relativeLink('address/$address')}"));
+        "${isolate.relativeLink('address/$address')}"));
   }
 
   void _updateFragmentationData() {
     if (fragmentation == null || _fragmentationCanvas == null) {
       return;
     }
     _updateClassList(
         fragmentation['class_list'], fragmentation['free_class_id']);
     var pages = fragmentation['pages'];
     var width = _fragmentationCanvas.parent.client.width;
@@ skipping 34 matching lines @@
       pixel = pixel.next();
     }
     _fragmentationCanvas.context2D.putImageData(
         _fragmentationData, 0, 0, 0, startY, _fragmentationData.width, endY);
     // Continue with the next page, asynchronously.
     new Future(() {
       _renderPages(startPage + 1);
     });
   }
 
+  void isolateChanged(oldValue) {
+    if (isolate == null) {
+      fragmentation = null;
+      return;
+    }
+    isolate.invokeRpc('getHeapMap', {}).then((ServiceMap response) {
+      assert(response['type'] == 'HeapMap');
+      fragmentation = response;
+    }).catchError((e, st) {
+      Logger.root.info('$e $st');
+    });
+  }
+
   void refresh(var done) {
-    if (fragmentation == null) {
+    if (isolate == null) {
       return;
     }
-    fragmentation.isolate.get('heapmap').then((ServiceMap response) {
+    isolate.invokeRpc('getHeapMap', {}).then((ServiceMap response) {
       assert(response['type'] == 'HeapMap');
       fragmentation = response;
     }).catchError((e, st) {
       Logger.root.info('$e $st');
     }).whenComplete(done);
   }
 
   void fragmentationChanged(oldValue) {
     // Async, in case attached has not yet run (observed in JS version).
     new Future(() {
       _updateFragmentationData();
     });
   }
-}
+}