Service Worker: Add metrics and timeout for starting a Service Worker.

content/common/service_worker/service_worker_status_code.cc

Index: content/common/service_worker/service_worker_status_code.cc
diff --git a/content/common/service_worker/service_worker_status_code.cc b/content/common/service_worker/service_worker_status_code.cc
index 35aaa86622e99e7b21227b985c52d5e836579729..e8f8b5574088f01f322132060fcaa9384379b964 100644
--- a/content/common/service_worker/service_worker_status_code.cc
+++ b/content/common/service_worker/service_worker_status_code.cc
@@ -39,6 +39,10 @@ const char* ServiceWorkerStatusToString(ServiceWorkerStatusCode status) {
              "Promise rejected)";
     case SERVICE_WORKER_ERROR_STATE:
       return "The ServiceWorker state was not valid";
+    case SERVICE_WORKER_ERROR_TIMEOUT:
+      return "The ServiceWorker timed out.";

[kinuko, 2015/03/02 03:19:33]

nit: not remember why, but it looks we don't seem to add period in this method
(so probably we should not do so here or add periods to all)

[falken, 2015/03/02 04:19:17]

to minimize patch, removed the period

+    case SERVICE_WORKER_ERROR_MAX_VALUE:
+      NOTREACHED();
   }
   NOTREACHED();
   return "";