M57: service worker: Add UMA for navigation preload response timing.

content/browser/service_worker/service_worker_url_request_job.h

 // Copyright 2014 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_URL_REQUEST_JOB_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_URL_REQUEST_JOB_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 220 matching lines @@
   // Wrapper that gathers parameters to |on_start_completed_callback_| and then
   // calls it.
   void OnStartCompleted() const;
 
   bool IsMainResourceLoad() const;
 
   // For waiting for files sizes of request body files with unknown sizes.
   bool HasRequestBody();
   void RequestBodyFileSizesResolved(bool success);
 
+  // Called back from
+  // ServiceWorkerFetchEventDispatcher::MaybeStartNavigationPreload when the
+  // navigation preload response starts.
+  void OnNavigationPreloadResponse();
+
+  void MaybeReportNavigationPreloadMetrics();
+
   // Not owned.
   Delegate* delegate_;
 
   // Timing info to show on the popup in Devtools' Network tab.
   net::LoadTimingInfo load_timing_info_;
+
+  // When the worker was asked to prepare for the fetch event. Preparation may
+  // include activation and startup.
   base::TimeTicks worker_start_time_;
+
+  // When the worker confirmed it's ready for the fetch event. If it was already
+  // activated and running when asked to prepare, this should be nearly the same
+  // as |worker_start_time_|).
   base::TimeTicks worker_ready_time_;
+
+  // When the response started.
   base::Time response_time_;
 
+  // When the navigation preload response started.
+  base::TimeTicks navigation_preload_response_time_;
+
+  // True if the worker was already in ACTIVATED status when asked to prepare
+  // for the fetch event.
+  bool worker_already_activated_ = false;
+
+  // The status the worker was in when asked to prepare for the fetch event.
+  EmbeddedWorkerStatus initial_worker_status_ = EmbeddedWorkerStatus::STOPPED;
+
+  // If worker startup occurred during preparation, the situation that startup
+  // occurred in.
+  ServiceWorkerMetrics::StartSituation worker_start_situation_ =
+      ServiceWorkerMetrics::StartSituation::UNKNOWN;
+
+  // True if navigation preload was enabled.
+  bool did_navigation_preload_ = false;
+
+  // True if navigation preload metrics were reported.
+  bool reported_navigation_preload_metrics_ = false;
+
   ResponseType response_type_;
+
+  // True if URLRequestJob::Start() has been called.
   bool is_started_;
 
   net::HttpByteRange byte_range_;
   std::unique_ptr<net::HttpResponseInfo> range_response_info_;
   std::unique_ptr<net::HttpResponseInfo> http_response_info_;
   // Headers that have not yet been committed to |http_response_info_|.
   scoped_refptr<net::HttpResponseHeaders> http_response_headers_;
   std::vector<GURL> response_url_list_;
   blink::WebServiceWorkerResponseType service_worker_response_type_;
 
@@ skipping 23 matching lines @@
   ResponseBodyType response_body_type_ = UNKNOWN;
   bool did_record_result_ = false;
 
   bool response_is_in_cache_storage_ = false;
   std::string response_cache_storage_cache_name_;
 
   ServiceWorkerHeaderList cors_exposed_header_names_;
 
   std::unique_ptr<FileSizeResolver> file_size_resolver_;
 
-  bool worker_already_activated_ = false;
-  EmbeddedWorkerStatus initial_worker_status_ = EmbeddedWorkerStatus::STOPPED;
-  bool did_navigation_preload_ = false;
-
   base::WeakPtrFactory<ServiceWorkerURLRequestJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerURLRequestJob);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_URL_REQUEST_JOB_H_