Include required parameter names when completing a method call.

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

Index: pkg/analysis_server/lib/src/services/completion/suggestion_builder.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/suggestion_builder.dart b/pkg/analysis_server/lib/src/services/completion/suggestion_builder.dart
index 2c5a4e2f1549a58104f8ff58ad14048584a8245e..584855a04a82da0bd6dc5a9d72f4a1436bbcd824 100644
--- a/pkg/analysis_server/lib/src/services/completion/suggestion_builder.dart
+++ b/pkg/analysis_server/lib/src/services/completion/suggestion_builder.dart
@@ -12,6 +12,7 @@ import 'package:analysis_server/src/protocol_server.dart' hide Element,
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/utilities_dart.dart';
 
 /**
  * Create a suggestion based upon the given imported element.
@@ -383,6 +384,17 @@ class _AbstractSuggestionBuilder extends GeneralizingElementVisitor {
         suggestion.returnType = typeName;
       }
     }
+    if (element is ExecutableElement && element is! PropertyAccessorElement) {
+      suggestion.parameterNames = element.parameters.map(
+          (ParameterElement parameter) => parameter.name).toList();
+      suggestion.parameterTypes = element.parameters.map(
+          (ParameterElement parameter) => parameter.type.displayName).toList();

[danrubel, 2015/01/06 23:49:36]

Can parameter.type ever be null?

[Paul Berry, 2015/01/07 15:39:14]

My belief is that it should never be null, but I will double check with Brian
this morning.

+      suggestion.requiredParameterCount = element.parameters.where(
+          (ParameterElement parameter) =>
+              parameter.parameterKind == ParameterKind.REQUIRED).length;
+      suggestion.hasNamedParameters = element.parameters.any(
+          (ParameterElement parameter) => parameter.parameterKind == ParameterKind.NAMED);
+    }
     request.suggestions.add(suggestion);
   }
 }