VM restart + shutdown fixes

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 425 matching lines @@
     <div id="consoleText" class="console">
       <!-- Console output is added programmatically -->
     </div>
   </template>
 </polymer-element>
 
 <polymer-element name="debugger-input" extends="observatory-element">
   <template>
     <link rel="stylesheet" href="css/shared.css">
     <style>
+      .container {
+        height: 100%;
+        display: flex;
+        flex-direction: row;
+        justify-content: space-between;
+      }
       .textBox {
+        flex: 1 1 auto;
         margin: 20px;
         padding: 5px;
         font: 400 16px consolas, courier, monospace;
         width: 95%;
       }
+      .modalPrompt {
+        flex: 0 0 auto;
+        margin-top: 20px;
+        margin-left: 20px;
+        padding: 5px;
+        font: 400 16px consolas, courier, monospace;
+        color: red;
+      }
     </style>
-    <input id="textBox" class="textBox" type="text" value="{{ text }}" autofocus>
+    <div class="container">
+      <template if="{{ modalPrompt != null }}">
+        <div class="modalPrompt">{{ modalPrompt }}</div>
+      </template>
+      <input id="textBox" class="textBox" type="text" value="{{ text }}" autofocus>
+    </div>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="debugger.dart"></script>