Add breadcrumb for the VM.

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

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="curly_block.html">
 <link rel="import" href="eval_box.html">
 <link rel="import" href="eval_link.html">
 <link rel="import" href="field_ref.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="instance_ref.html">
 <link rel="import" href="library_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">
 <link rel="import" href="view_footer.html">
 
 <polymer-element name="class-view" extends="observatory-element">
   <template>
     <link rel="stylesheet" href="css/shared.css">
     <nav-bar>
       <top-nav-menu></top-nav-menu>
+      <vm-nav-menu vm="{{ cls.isolate.vm }}"></vm-nav-menu>

[Cutch, 2015/04/29 18:43:41]

what about app.vm? Might even be able to drop the published attribute on
vm-nav-menu.

[turnidge, 2015/04/29 19:17:26]

Ryan's current code will fare better if we add support for multiple vm's.

[rmacnak, 2015/04/29 19:37:20]

Doesn't work without published.

[turnidge, 2015/05/01 17:14:07]

I think that cls.isolate.vm is fine.

       <isolate-nav-menu isolate="{{ cls.isolate }}"></isolate-nav-menu>
       <library-nav-menu library="{{ cls.library }}"></library-nav-menu>
       <class-nav-menu cls="{{ cls }}" last="{{ true }}"></class-nav-menu>
       <nav-refresh callback="{{ refreshCoverage }}" label="Refresh Coverage"></nav-refresh>
       <nav-refresh callback="{{ refresh }}"></nav-refresh>
     </nav-bar>
 
     <div class="content">
       <h1>
         <template if="{{ cls.isAbstract }}">
@@ skipping 178 matching lines @@
     <script-inset script="{{ cls.script }}"
                   startPos="{{ cls.tokenPos }}"
                   endPos="{{ cls.endTokenPos }}">
     </script-inset>
 
     <view-footer></view-footer>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="class_view.dart"></script>