first cut argument list completion suggestions

pkg/analysis_server/lib/src/generated_protocol.dart

Index: pkg/analysis_server/lib/src/generated_protocol.dart
diff --git a/pkg/analysis_server/lib/src/generated_protocol.dart b/pkg/analysis_server/lib/src/generated_protocol.dart
index 87020a8625e81b13b3247f6179f2bcba1dcc3c90..0df308f619b97ae42d81043b629454dadae11e68 100644
--- a/pkg/analysis_server/lib/src/generated_protocol.dart
+++ b/pkg/analysis_server/lib/src/generated_protocol.dart
@@ -5571,6 +5571,12 @@ class CompletionSuggestion implements HasToJson {
  * }
  */
 class CompletionSuggestionKind implements Enum {
+  /**
+   * A list of arguments for the method or function that is being invoked. For
+   * this suggestion kind, the completion field is a textual representation of
+   * the invocation and the parameterNames, parameterTypes, and
+   * requiredParameterCount attributes are defined.
+   */
   static const ARGUMENT_LIST = const CompletionSuggestionKind._("ARGUMENT_LIST");
 
   static const IMPORT = const CompletionSuggestionKind._("IMPORT");