Addition of AnalysisServer.isSocketOpen for clients to know if the server is still running.

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 0f16a1205f2b348c8c819999b2916688fcc09b40..79be0b08fa85eec07683d1c52aef1a2bda56905d 100644
--- a/pkg/analysis_server/lib/src/generated_protocol.dart
+++ b/pkg/analysis_server/lib/src/generated_protocol.dart
@@ -5839,9 +5839,9 @@ class CompletionSuggestion implements HasToJson {
   Element element;
 
   /**
-   * The return type of the getter, function or method being suggested. This
-   * field is omitted if the suggested element is not a getter, function or
-   * method.
+   * The return type of the getter, function or method or the type of the field
+   * being suggested. This field is omitted if the suggested element is not a
+   * getter, function or method.
    */
   String returnType;