When attempting to navigate to a page for an isolate that doesn't exist, offer to

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

Index: runtime/observatory/lib/src/elements/isolate_reconnect.html
diff --git a/runtime/observatory/lib/src/elements/isolate_reconnect.html b/runtime/observatory/lib/src/elements/isolate_reconnect.html
new file mode 100644
index 0000000000000000000000000000000000000000..967403801294b21276161101b72abf1f65cc48c5
--- /dev/null
+++ b/runtime/observatory/lib/src/elements/isolate_reconnect.html
@@ -0,0 +1,34 @@
+<link rel="import" href="../../../../packages/polymer/polymer.html">
+<link rel="import" href="nav_bar.html">
+<link rel="import" href="observatory_element.html">
+
+<polymer-element name="isolate-reconnect" extends="observatory-element">
+  <template>
+    <link rel="stylesheet" href="css/shared.css">
+    <style>
+      .doubleSpaced {
+	line-height: 2em;
+      }
+    </style>
+
+    <nav-bar>
+      <top-nav-menu last="{{ true }}"></top-nav-menu>
+    </nav-bar>
+
+    <div class="content-centered">
+      <h1 class="doubleSpaced">Isolate {{ missingIsolateId }} no longer exists</h1>
+      <div class="memberList">
+         <template repeat="{{ i in app.vm.isolates }}">
+           <div class="memberItem doubleSpaced">
+             Continue in <a _href="{{ linkToContinueIn(i) }}">{{ i.id }} ({{ i.name }})</a>
+           </div>
+         </template>
+         <div class="memberItem doubleSpaced">
+           Go to <a _href="{{ gotoLink('/vm') }}">isolates summary</a>
+         </div>
+      </div>
+    </div>
+  </template>
+</polymer-element>
+
+<script type="application/dart" src="isolate_reconnect.dart"></script>