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

content/browser/service_worker/service_worker_version.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 
 #include <stdint.h>
 
 #include <functional>
@@ skipping 585 matching lines @@
   void OnStoppedInternal(EmbeddedWorkerInstance::Status old_status);
 
   // Called when the remote side of a connection to a mojo service is lost.
   void OnMojoConnectionError(const char* service_name);
 
   // Called at the beginning of each Dispatch*Event function: records
   // the time elapsed since idle (generally the time since the previous
   // event ended).
   void OnBeginEvent();
 
+  // Resets |start_worker_first_purpose_| and fires and clears all start
+  // callbacks.
+  void RunStartCallbacks(ServiceWorkerStatusCode status);
+
   const int64_t version_id_;
   const int64_t registration_id_;
   const GURL script_url_;
   const GURL scope_;
   std::vector<GURL> foreign_fetch_scopes_;
   std::vector<url::Origin> foreign_fetch_origins_;
   bool has_fetch_handler_ = true;
 
   Status status_ = NEW;
   std::unique_ptr<EmbeddedWorkerInstance> embedded_worker_;
@@ skipping 56 matching lines @@
   // If not OK, the reason that StartWorker failed. Used for
   // running |start_callbacks_|.
   ServiceWorkerStatusCode start_worker_status_ = SERVICE_WORKER_OK;
 
   std::unique_ptr<PingController> ping_controller_;
   std::unique_ptr<Metrics> metrics_;
   const bool should_exclude_from_uma_ = false;
 
   bool stop_when_devtools_detached_ = false;
 
+  // It is used to keep the first purpose of starting the worker for UMA.
+  // Cleared when |start_callbacks_| are executed in RunStartCallbacks().
+  std::unique_ptr<ServiceWorkerMetrics::EventType> start_worker_first_purpose_;
+
   base::WeakPtrFactory<ServiceWorkerVersion> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerVersion);
 };
 
 template <typename Interface>
 base::WeakPtr<Interface> ServiceWorkerVersion::GetMojoServiceForRequest(
     int request_id) {
   DCHECK_EQ(RUNNING, running_status());
   PendingRequest<StatusCallback>* request = custom_requests_.Lookup(request_id);
@@ skipping 66 matching lines @@
 
   // At this point |this| can have been deleted, so don't do anything other
   // than returning.
 
   return true;
 }
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_