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

runtime/observatory/lib/src/elements/debugger.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 debugger_page_element;
 
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:observatory/service.dart';
 import 'package:polymer/polymer.dart';
@@ skipping 27 matching lines @@
   }
 }
 
 @CustomTag('debugger-stack')
 class DebuggerStackElement extends ObservatoryElement {
   @published Isolate isolate;
   @published ServiceMap stack;
   @published int activeFrame = 0;
 
   isolateChanged(oldValue) {
-    isolate.get('stacktrace').then((result) {
+    isolate.getStack().then((result) {
         stack = result;
-      });
+    });
   }
 
   DebuggerStackElement.created() : super.created();
 }
 
 @CustomTag('debugger-frame')
 class DebuggerFrameElement extends ObservatoryElement {
   @published ObservableMap frame;
 
   // When true, the frame will start out expanded.
@@ skipping 65 matching lines @@
             print('Debugger command (not implemented): $text');
             text = '';
             break;
         }
       });
   }
 
   DebuggerInputElement.created() : super.created();
 }