Introduce ServiceWorker.ActivatedWorkerPreparationForMainFrame.Time UMA.

content/browser/service_worker/service_worker_url_request_job.h

Index: content/browser/service_worker/service_worker_url_request_job.h
diff --git a/content/browser/service_worker/service_worker_url_request_job.h b/content/browser/service_worker/service_worker_url_request_job.h
index 58ab863a47dbb9e3e580a7a3994fbc0dc5833c4c..1535561ca2d65a901f4a6c04dc13c8d86769ee61 100644
--- a/content/browser/service_worker/service_worker_url_request_job.h
+++ b/content/browser/service_worker/service_worker_url_request_job.h
@@ -14,6 +14,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
+#include "content/browser/service_worker/embedded_worker_status.h"
 #include "content/browser/service_worker/service_worker_metrics.h"
 #include "content/browser/streams/stream_read_observer.h"
 #include "content/browser/streams/stream_register_observer.h"
@@ -179,7 +180,7 @@ class CONTENT_EXPORT ServiceWorkerURLRequestJob
   void CreateRequestBodyBlob(std::string* blob_uuid, uint64_t* blob_size);
 
   // For FORWARD_TO_SERVICE_WORKER case.
-  void DidPrepareFetchEvent();
+  void DidPrepareFetchEvent(scoped_refptr<ServiceWorkerVersion> version);
   void DidDispatchFetchEvent(
       ServiceWorkerStatusCode status,
       ServiceWorkerFetchEventResult fetch_result,
@@ -280,6 +281,9 @@ class CONTENT_EXPORT ServiceWorkerURLRequestJob
 
   std::unique_ptr<BlobConstructionWaiter> blob_construction_waiter_;
 
+  bool worker_already_activated_ = false;
+  EmbeddedWorkerStatus initial_worker_status_ = EmbeddedWorkerStatus::STOPPED;
+
   base::WeakPtrFactory<ServiceWorkerURLRequestJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerURLRequestJob);