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

runtime/observatory/lib/src/elements/isolate_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 isolate_view_element;
 
 import 'dart:async';
 import 'observatory_element.dart';
 import 'package:observatory/app.dart';
 import 'package:observatory/service.dart';
@@ skipping 65 matching lines @@
   }
 }
 
 @CustomTag('isolate-view')
 class IsolateViewElement extends ObservatoryElement {
   @published Isolate isolate;
   Timer _updateTimer;
   TagProfileChart tagProfileChart = new TagProfileChart();
   IsolateViewElement.created() : super.created();
 
-  Future<ServiceObject> eval(String text) {
-    return isolate.get(
-        isolate.rootLib.id + "/eval?expr=${Uri.encodeComponent(text)}");
+  Future<ServiceObject> eval(String expression) {
+    return isolate.eval(isolate.rootLib, expression);
   }
 
   void _updateTagProfile() {
     isolate.updateTagProfile().then((tagProfile) {
       tagProfileChart.update(tagProfile);
       _drawTagProfileChart();
       if (_updateTimer != null) {
         // Start the timer again.
         _updateTimer = new Timer(new Duration(seconds: 1), _updateTagProfile);
       }
@@ skipping 42 matching lines @@
 
   Future resume(_) {
     return isolate.get("resume").then((result) {
         // TODO(turnidge): Instead of asserting here, handle errors
         // properly.
         assert(result.type == 'Success');
         return isolate.reload();
       });
   }
 }