improve completion performance status page

pkg/analysis_server/lib/src/domain_completion.dart

Index: pkg/analysis_server/lib/src/domain_completion.dart
diff --git a/pkg/analysis_server/lib/src/domain_completion.dart b/pkg/analysis_server/lib/src/domain_completion.dart
index 06c518864c36fff5b531cbcf05cb669c6130bfcb..9252382c0bcf178a0fb4a1bd647fe47df0c4aa12 100644
--- a/pkg/analysis_server/lib/src/domain_completion.dart
+++ b/pkg/analysis_server/lib/src/domain_completion.dart
@@ -175,7 +175,7 @@ class CompletionDomainHandler implements RequestHandler {
     int notificationCount = 0;
     manager.results(completionRequest).listen((CompletionResult result) {
       ++notificationCount;
-      performance.logElapseTime("notification $notificationCount", () {
+      performance.logElapseTime("notification $notificationCount send", () {
         sendCompletionNotification(
             completionId,
             result.replacementOffset,
@@ -183,6 +183,9 @@ class CompletionDomainHandler implements RequestHandler {
             result.suggestions,
             result.last);
       });
+      if (notificationCount == 1) {
+        performance.logFirstNotificationComplete('notification 1 complete');
+      }
       if (result.last) {
         performance.notificationCount = notificationCount;
         performance.suggestionCount = result.suggestions.length;