Add stopgap for angular autocompletion.

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index 2de4bbe8337a3181a5ed9795d81561e23fc61d7d..102fbad905d00b94f447125404b0bfb8fefd171d 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -374,6 +374,12 @@ class AnalysisServer {
   Function onNoAnalysisResult;
 
   /**
+   * This exists as a temporary stopgap for plugins, until the official plugin
+   * API is complete.
+   */
+  Function onNoAnalysisCompletion;
+
+  /**
    * The set of the files that are currently priority.
    */
   final Set<String> priorityFiles = new Set<String>();