add class type alias suggestions

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

Index: pkg/analysis_server/lib/src/services/completion/local_computer.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/local_computer.dart b/pkg/analysis_server/lib/src/services/completion/local_computer.dart
index e2e81af105449c49212838b4ee068f87f490c310..8e0ba88f15180cba18976b9dafbb6cb74949ec25 100644
--- a/pkg/analysis_server/lib/src/services/completion/local_computer.dart
+++ b/pkg/analysis_server/lib/src/services/completion/local_computer.dart
@@ -133,11 +133,20 @@ class _LocalVisitor extends GeneralizingAstVisitor<dynamic> {
       } else if (declaration is TopLevelVariableDeclaration) {
         _addTopLevelVarSuggestions(declaration.variables);
       } else if (declaration is ClassTypeAlias) {
-        _addSuggestion(
+        CompletionSuggestion suggestion = _addSuggestion(
             declaration.name,
             CompletionSuggestionKind.CLASS_ALIAS,
             null,
             null);
+        if (suggestion != null) {
+          suggestion.element = _createElement(
+              protocol.ElementKind.CLASS_TYPE_ALIAS,
+              declaration.name,
+              null,
+              NO_RETURN_TYPE,
+              true,
+              _isDeprecated(declaration.metadata));
+        }
       } else if (declaration is FunctionTypeAlias) {
         CompletionSuggestion suggestion = _addSuggestion(
             declaration.name,