Speculatively launch Service Workers on mouse/touch events. [4/5]

content/browser/service_worker/service_worker_version.h

Index: content/browser/service_worker/service_worker_version.h
diff --git a/content/browser/service_worker/service_worker_version.h b/content/browser/service_worker/service_worker_version.h
index db5392c1fcd62226bbc6a6b777293a67979c1e15..4074eba464b6e1ad7c92c8bf62b01249aee59759 100644
--- a/content/browser/service_worker/service_worker_version.h
+++ b/content/browser/service_worker/service_worker_version.h
@@ -24,6 +24,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
+#include "base/optional.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/timer/timer.h"
 #include "content/browser/service_worker/embedded_worker_instance.h"
@@ -651,6 +652,10 @@ class CONTENT_EXPORT ServiceWorkerVersion
   // event ended).
   void OnBeginEvent();
 
+  // Resets |start_worker_first_purpose_| and fires and clears all start
+  // callbacks.
+  void FinishStartWorker(ServiceWorkerStatusCode status);
+
   const int64_t version_id_;
   const int64_t registration_id_;
   const GURL script_url_;
@@ -727,6 +732,10 @@ class CONTENT_EXPORT ServiceWorkerVersion
 
   bool stop_when_devtools_detached_ = false;
 
+  // Keeps the first purpose of starting the worker for UMA. Cleared in
+  // FinishStartWorker().
+  base::Optional<ServiceWorkerMetrics::EventType> start_worker_first_purpose_;
+
   base::WeakPtrFactory<ServiceWorkerVersion> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerVersion);