Add breadcrumb for the VM.

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

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="instance_ref.html">
 <link rel="import" href="observatory_element.html">
 <link rel="import" href="nav_bar.html">
 <link rel="import" href="script_ref.html">
 <link rel="import" href="view_footer.html">
 
 <polymer-element name="code-view" extends="observatory-element">
   <template>
@@ skipping 24 matching lines @@
         display: block;
       }
 
       tr:hover > td {
         background-color: #F4C7C3;
       }
 
     </style>
     <nav-bar>
       <top-nav-menu></top-nav-menu>
+      <vm-nav-menu vm="{{ code.isolate.vm }}"></vm-nav-menu>
       <isolate-nav-menu isolate="{{ code.isolate }}"></isolate-nav-menu>
       <nav-menu link="{{ makeLink('/inspect', code) }}" anchor="{{ code.name }}" last="{{ true }}"></nav-menu>
       <nav-refresh callback="{{ refresh }}"></nav-refresh>
       <nav-refresh callback="{{ refreshTicks }}" label="Refresh Ticks"></nav-refresh>
     </nav-bar>
     <div class="content">
       <template if="{{ code.isDartCode && code.isOptimized }}">
         <h1>Optimized code for {{ code.name }}</h1>
       </template>
       <template if="{{ !(code.isDartCode && code.isOptimized) }}">
@@ skipping 75 matching lines @@
       </tr>
       </thead>
       <tbody class="monospace" id="disassemblyTableBody">
       </tbody>
     </table>
     <view-footer></view-footer>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="code_view.dart"></script>