Initial isolate reload support

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">
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               </template>
             </div>
             <div class="memberItem">
               <div class="memberName">isolate id</div>
               <div class="memberValue">{{ isolate.number }}</div>
             </div>
             <div class="memberItem">
               <div class="memberName">service protocol extensions</div>
               <div class="memberValue">{{ isolate.extensionRPCs }}</div>
             </div>
+
+            <div class="memberItem">
+              <div class="memberName">
+                <action-link callback="{{ reloadSources }}"
+                             label="reload sources">
+                </action-link>
+              </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">
           <template repeat="{{ lib in isolate.libraries }}">
@@ skipping 16 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>