Initial GUI for review

runtime/bin/vmservice/client/observatory/packages/observatory/src/observatory_elements/observatory_application.dart

Index: runtime/bin/vmservice/client/observatory/packages/observatory/src/observatory_elements/observatory_application.dart
diff --git a/runtime/bin/vmservice/client/observatory/packages/observatory/src/observatory_elements/observatory_application.dart b/runtime/bin/vmservice/client/observatory/packages/observatory/src/observatory_elements/observatory_application.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9138c48d765cafdb5fb57d9c98cb9757573aef51
--- /dev/null
+++ b/runtime/bin/vmservice/client/observatory/packages/observatory/src/observatory_elements/observatory_application.dart
@@ -0,0 +1,15 @@
+library observatory_application_element;
+
+import 'package:polymer/polymer.dart';
+import 'package:observatory/observatory.dart';
+
+/// Main application tag. Responsible for instantiating an instance of
+/// [ObservatoryApplication] which is passed declaratively to all child
+/// elements.
+@CustomTag('observatory-application')
+class ObservatoryApplicationElement extends ObservatoryElement {
+  void created() {
+    super.created();
+    app = new ObservatoryApplication();
+  }
+}