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

runtime/observatory/lib/src/elements/debugger.html

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="nav_bar.html">
 <link rel="import" href="observatory_element.html">
 <link rel="import" href="script_inset.html">
 <link rel="import" href="script_ref.html">
 
 <!-- TODO(turnidge): Use core-icon once core_elements work properly in
      devtools -->
 <polymer-element name="icon-expand-less" noscript>
@@ skipping 36 matching lines @@
         flex: 1 1 auto;
         overflow-y: auto;
       }
       .commandline {
         flex: 0 0 auto;
       }
     </style>
 
     <div class="container">
       <nav-bar>
-        <top-nav-menu last="{{ true }}"></top-nav-menu>
-        <isolate-nav-menu isolate="{{ isolate }}" last="{{ true }}">
+        <top-nav-menu></top-nav-menu>
+        <isolate-nav-menu isolate="{{ isolate }}">
         </isolate-nav-menu>
+        <nav-menu link="{{ '/debugger' + isolate.link) }}" anchor="debugger" last="{{ true }}"></nav-menu>
         <nav-control></nav-control>
       </nav-bar>
 
       <div id="stack" class="stack">
         <debugger-stack isolate="{{ isolate }}"></debugger-stack>
       </div>
       <!--
       <core-splitter direction="up" allowOverflow=true></core-splitter>
       <div class="console">
         <debugger-console isolate="{{ isolate }}"></debugger-console>
       </div>
       <div class="commandline">
         <debugger-input isolate="{{ isolate }}"></debugger-input>
       </div>
       -->
     </div>
   </template>
 </polymer-element>
 
 <polymer-element name="debugger-stack" extends="observatory-element">
   <template>
     <link rel="stylesheet" href="css/shared.css">
     <template if="{{ stack == null }}">
       Loading stack frames
     </template>
     <template if="{{ stack != null }}">
       <ul class="list-group">
-        <template repeat="{{ frame in stack['members'] }}">
+        <template repeat="{{ frame in stack['frames'] }}">
           <li class="list-group-item">
             <debugger-frame frame="{{ frame }}"
                             expand="{{ frame['depth'] == activeFrame }}">
             </debugger-frame>
           </li>
         </template>
       </ul>
     </template>
   </template>
 </polymer-element>
@@ skipping 119 matching lines @@
       .textBox {
         font: 400 16px 'Montserrat', sans-serif;
         width: 100%;
       }
     </style>
     <input id="textBox" class="textBox" type="text" value="{{ text }}">
   </template>
 </polymer-element>
 
 <script type="application/dart" src="debugger.dart"></script>