ServiceWorker: More accurate StartWorker result and UMA

content/browser/service_worker/service_worker_register_job.cc

Index: content/browser/service_worker/service_worker_register_job.cc
diff --git a/content/browser/service_worker/service_worker_register_job.cc b/content/browser/service_worker/service_worker_register_job.cc
index 3435177898635c109f587822a8d9d34bcd910953..5be6b5193172c1c564e9dc96ab2570a5eeb893e0 100644
--- a/content/browser/service_worker/service_worker_register_job.cc
+++ b/content/browser/service_worker/service_worker_register_job.cc
@@ -450,7 +450,9 @@ void ServiceWorkerRegisterJob::CompleteInternal(
       if (should_uninstall_on_failure_)
         registration()->ClearWhenReady();
       if (new_version()) {
-        if (status != SERVICE_WORKER_ERROR_EXISTS)
+        if (status == SERVICE_WORKER_ERROR_EXISTS)
+          new_version()->SetStartWorkerStatusCode(SERVICE_WORKER_ERROR_EXISTS);
+        else
           new_version()->ReportError(status, status_message);
         registration()->UnsetVersion(new_version());
         new_version()->Doom();