Initial GUI for review

runtime/bin/vmservice/client/observatory/packages/observatory/src/observatory_elements/stack_trace.html

Index: runtime/bin/vmservice/client/observatory/packages/observatory/src/observatory_elements/stack_trace.html
diff --git a/runtime/bin/vmservice/client/observatory/packages/observatory/src/observatory_elements/stack_trace.html b/runtime/bin/vmservice/client/observatory/packages/observatory/src/observatory_elements/stack_trace.html
new file mode 100644
index 0000000000000000000000000000000000000000..fdfba1136e4e36182b9c2cf114cff195d641485a
--- /dev/null
+++ b/runtime/bin/vmservice/client/observatory/packages/observatory/src/observatory_elements/stack_trace.html
@@ -0,0 +1,24 @@
+<polymer-element name="stack-trace" attributes="app trace">
+  <template>
+  <div class="alert alert-info">Stack Trace</div>
+  <table class="table table-hover">
+    <thead>
+      <tr>
+        <th>Depth</th>
+        <th>Function</th>
+        <th>Url</th>
+        <th>Line</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr template repeat="{{ frame in trace['members'] }}">
+        <td>{{$index}}</td>
+        <td>{{ frame['name'] }}</td>
+        <td>{{ frame['url'] }}</td>
+        <td>{{ frame['line'] }}</td>
+      </tr>
+    </tbody>
+  </table>
+  </template>
+  <script type="application/dart" src="stack_trace.dart"></script>
+</polymer-element>