Add links to Observatory documentation and bug tracking.

runtime/observatory/observatory_sources.gypi

Index: runtime/observatory/observatory_sources.gypi
diff --git a/runtime/observatory/observatory_sources.gypi b/runtime/observatory/observatory_sources.gypi
index fadca29158e6abfe1a6d542794fac11fd022d772..390e975d42e599d3799c6c75c3ce571b6cf8d2f1 100644
--- a/runtime/observatory/observatory_sources.gypi
+++ b/runtime/observatory/observatory_sources.gypi
@@ -123,6 +123,8 @@
     'lib/src/elements/service_view.html',
     'lib/src/elements/sliding_checkbox.dart',
     'lib/src/elements/sliding_checkbox.html',
+    'lib/src/elements/view_footer.dart',
+    'lib/src/elements/view_footer.html',
     'lib/src/elements/vm_connect.dart',
     'lib/src/elements/vm_connect.html',
     'lib/src/elements/vm_ref.dart',
@@ -140,4 +142,4 @@
     'web/main.dart',
     'web/favicon.ico',
   ],
-}
+}