Allow script insets to scroll.

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 353 matching lines @@
           </template>
         </div>
       </a>
 
       <template if="{{expanded}}">
         <div class="messageDetails">
           <div class="flex-row-wrap">
             <div class="flex-item-script">
               <template if="{{ message.handler != null }}">
               <source-inset height="{{ scriptHeight }}"
-                              location="{{ message.handler.location }}"
-                              inDebuggerContext="{{ true }}">
+                            location="{{ message.handler.location }}"
+                            inDebuggerContext="{{ true }}">
               </source-inset>
               </template>
             </div>
             <div class="flex-item-vars">
               <div class="memberItem">
                 <div class="memberName"></div>
                 <div class="memberValue">
                   <eval-link callback="{{ previewMessage }}" label="[preview]" result="{{ preview }}"></eval-link>
                 </div>
               </div>
@@ skipping 60 matching lines @@
         padding: 5px;
         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>