add type static constants suggestions

pkg/analysis_server/lib/src/services/completion/invocation_computer.dart

Index: pkg/analysis_server/lib/src/services/completion/invocation_computer.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/invocation_computer.dart b/pkg/analysis_server/lib/src/services/completion/invocation_computer.dart
index 69debf42e0d662a5470585ab7a2d5ac5a2ee903d..3669bd43ddb62d6915128eae3cdfdb9e2a58d404 100644
--- a/pkg/analysis_server/lib/src/services/completion/invocation_computer.dart
+++ b/pkg/analysis_server/lib/src/services/completion/invocation_computer.dart
@@ -136,6 +136,17 @@ class _InvocationElementVisitor extends GeneralizingElementVisitor<Future<bool>>
   _InvocationElementVisitor(this.request);
 
   @override
+  Future<bool> visitClassElement(ClassElement element) {
+    if (element != null) {
+      InterfaceType type = element.type;
+      if (type != null) {
+        ClassElementSuggestionBuilder.staticSuggestionsFor(request, type.element);
+      }
+    }
+    return new Future.value(false);
+  }
+
+  @override
   Future<bool> visitElement(Element element) {
     return new Future.value(false);
   }