Improve class-tree, class-view, and instance-view.

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

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="action_link.html">
 <link rel="import" href="curly_block.html">
 <link rel="import" href="eval_box.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="isolate_summary.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">
@@ skipping 72 matching lines @@
                 <div class="memberName">entry</div>
                 <div class="memberValue">
                   <function-ref ref="{{ isolate.entry }}"></function-ref>
                 </div>
               </template>
             </div>
             <div class="memberItem">
               <div class="memberName">isolate id</div>
               <div class="memberValue">{{ isolate.number }}</div>
             </div>
+            <div class="memberItem">
+              <div class="memberName">isolate extensions</div>

[Cutch, 2016/03/17 18:20:14]

"service protocol extensions" ?

[turnidge, 2016/03/17 18:33:06]

Done.

+              <div class="memberValue">{{ isolate.extensionRPCs }}</div>
+            </div>
           </div>
         </div>
       </div>
     </div>
 
     <div class="content-centered">
       <hr>
       libraries ({{ isolate.libraries.length }})
       <curly-block expand="{{ isolate.libraries.length <= 8 }}">
         <div class="memberList">
@@ skipping 17 matching lines @@
       <hr>
       <script-inset script="{{ rootLibrary.rootScript }}">
       </script-inset>
     </div>
 
     <view-footer></view-footer>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="isolate_view.dart"></script>