Show tooltip with local variable value in Observatory debugger

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

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="nav_bar.html">
 <link rel="import" href="eval_link.html">
 <link rel="import" href="observatory_element.html">
 <link rel="import" href="script_inset.html">
 <link rel="import" href="script_ref.html">
 
 <!-- TODO(turnidge): Use core-icon once core_elements work properly in
      devtools -->
@@ skipping 232 matching lines @@
             </div>
           </template>
         </div>
       </a>
 
       <template if="{{expanded}}">
         <div class="frameDetails">
           <div class="flex-row">
             <div class="flex-item-60-percent">
               <script-inset height="{{ scriptHeight }}"
-                            script="{{ frame['function'].script }}"
+                            script="{{ frame['function'].script }}"
                             startPos="{{ frame['function'].tokenPos }}"
                             endPos="{{ frame['function'].endTokenPos }}"
                             currentPos="{{ frame['tokenPos'] }}"
-                            inDebuggerContext="{{ true }}">
+                            inDebuggerContext="{{ true }}"
+                            variables="{{ frame['vars'] }}">
               </script-inset>
             </div>
             <div class="flex-item-40-percent">
               <div style="padding:10px;" class="memberList">
                 <template repeat="{{ v in frame['vars'] }}">
                   <div class="memberItem">
                     <div class="memberName">{{ v['name']}}</div>
                     <div class="memberValue">
                       <any-service-ref ref="{{ v['value'] }}">
                       </any-service-ref>
@@ skipping 151 matching lines @@
         margin: 20px;
         font: 400 16px consolas, courier, monospace;
         width: 95%;
       }
     </style>
     <input id="textBox" class="textBox" type="text" value="{{ text }}" autofocus>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="debugger.dart"></script>