observatory/vm: add support for computing/passing end tokens on classes

runtime/bin/vmservice/client/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">
 
 <polymer-element name="class-view" extends="observatory-element">
   <template>
     <link rel="stylesheet" href="css/shared.css">
     <nav-bar>
       <top-nav-menu></top-nav-menu>
       <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>
@@ skipping 158 matching lines @@
             </div>
           </div>
         </template>
     </div>
 
     <hr>
 
     <div class="content">
       <eval-box callback="{{ eval }}"></eval-box>
     </div>
+
+    <hr>
+    <script-inset script="{{ cls.script }}" pos="{{ cls.tokenPos }}" endPos="{{ cls.endTokenPos }}">
+    </script-inset>
+
     <br><br><br><br>
     <br><br><br><br>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="class_view.dart"></script>