Added js and js_util to observatory deps

runtime/observatory/pubspec.yaml

Index: runtime/observatory/pubspec.yaml
diff --git a/runtime/observatory/pubspec.yaml b/runtime/observatory/pubspec.yaml
index b00ab07bd0537ea4df7032a5d0cfd0ee0baccfde..e71be36827ad9858893e8fa9b89c5fcb4b95e7e3 100644
--- a/runtime/observatory/pubspec.yaml
+++ b/runtime/observatory/pubspec.yaml
@@ -18,6 +18,8 @@ dependencies:
   charted: ^0.3.0
   polymer: ^0.16.3
   unittest: < 0.12.0
+  js: ^0.6.0
+  js_util: ^0.2.0
   usage: any
 dependency_overrides:
   analyzer:
@@ -52,6 +54,10 @@ dependency_overrides:
     path: ../../third_party/observatory_pub_packages/packages/initialize
   intl:
     path: ../../third_party/observatory_pub_packages/packages/intl
+  js:
+    path: ../../third_party/observatory_pub_packages/packages/js
+  js_util:
+    path: ../../third_party/observatory_pub_packages/packages/js_util
   logging:
     path: ../../third_party/observatory_pub_packages/packages/logging
   matcher:
@@ -76,6 +82,8 @@ dependency_overrides:
     path: ../../third_party/observatory_pub_packages/packages/pool
   quiver:
     path: ../../third_party/observatory_pub_packages/packages/quiver
+  quiver_iterables:
+    path: ../../third_party/observatory_pub_packages/packages/quiver_iterables
   smoke:
     path: ../../third_party/observatory_pub_packages/packages/smoke
   source_maps: