Revert of "Speculatively launch Service Workers on mouse/touch events."

content/browser/service_worker/service_worker_metrics.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_METRICS_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_
 
 #include <stddef.h>
 #include <map>
 #include <set>
@@ skipping 93 matching lines @@
     MESSAGE = 8,
     NOTIFICATION_CLOSE = 9,
     FETCH_MAIN_FRAME = 10,
     FETCH_SUB_FRAME = 11,
     FETCH_SHARED_WORKER = 12,
     FETCH_SUB_RESOURCE = 13,
     UNKNOWN = 14,  // Used when event type is not known.
     FOREIGN_FETCH = 15,
     FETCH_WAITUNTIL = 16,
     FOREIGN_FETCH_WAITUNTIL = 17,
-    NAVIGATION_HINT_LINK_MOUSE_DOWN = 18,
-    NAVIGATION_HINT_LINK_TAP_UNCONFIRMED = 19,
-    NAVIGATION_HINT_LINK_TAP_DOWN = 20,
+    // NAVIGATION_HINT_LINK_MOUSE_DOWN = 18,  // Obsolete
+    // NAVIGATION_HINT_LINK_TAP_UNCONFIRMED = 19,  // Obsolete
+    // NAVIGATION_HINT_LINK_TAP_DOWN = 20,  // Obsolete
     // Used when external consumers want to add a request to
     // ServiceWorkerVersion to keep it alive.
     EXTERNAL_REQUEST = 21,
     PAYMENT_REQUEST = 22,
     BACKGROUND_FETCH_ABORT = 23,
     BACKGROUND_FETCH_CLICK = 24,
     BACKGROUND_FETCH_FAIL = 25,
     BACKGROUND_FETCHED = 26,
     // Add new events to record here.
     NUM_TYPES
@@ skipping 43 matching lines @@
     START_DURING_STARTUP,
     // Add new types here.
     NUM_TYPES
   };
 
   // Not used for UMA.
   enum class LoadSource { NETWORK, HTTP_CACHE, SERVICE_WORKER_STORAGE };
 
   class ScopedEventRecorder {
    public:
-    explicit ScopedEventRecorder(EventType start_worker_purpose);
+    explicit ScopedEventRecorder();
     ~ScopedEventRecorder();
 
     void RecordEventHandledStatus(EventType event, bool handled);
 
    private:
     struct EventStat {
       size_t fired_events = 0;
       size_t handled_events = 0;
     };
 
     // Records how much of dispatched events are handled.
     static void RecordEventHandledRatio(EventType event,
                                         size_t handled_events,
                                         size_t fired_events);
 
-    // Records the precision of the speculative launch of Service Workers for
-    // each navigation hint type. If there was no main/sub frame fetch event
-    // fired on the worker, |frame_fetch_event_fired| is false. This means that
-    // the speculative launch wasn't helpful.
-    static void RecordNavigationHintPrecision(EventType start_worker_purpose,
-                                              bool frame_fetch_event_fired);
-
     std::map<EventType, EventStat> event_stats_;
-    const EventType start_worker_purpose_;
 
     DISALLOW_COPY_AND_ASSIGN(ScopedEventRecorder);
   };
 
   // Converts an event type to a string. Used for tracing.
   static const char* EventTypeToString(EventType event_type);
 
   // If the |url| is not a special site, returns Site::OTHER.
   static Site SiteFromURL(const GURL& url);
 
@@ skipping 145 matching lines @@
 
   static void RecordRuntime(base::TimeDelta time);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServiceWorkerMetrics);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_