Add first party sites (PLUS, INBOX, DOCS) in ServiceWorkerSite UMA.

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 "base/macros.h"
@@ skipping 102 matching lines @@
     NUM_TYPES
   };
 
   // Used for UMA. Append only.
   enum class Site {
     OTHER,  // Obsolete for UMA. Use WITH_FETCH_HANDLER or
             // WITHOUT_FETCH_HANDLER.
     NEW_TAB_PAGE,
     WITH_FETCH_HANDLER,
     WITHOUT_FETCH_HANDLER,
+    PLUS,
+    INBOX,
+    DOCS,
     NUM_TYPES
   };
 
   // Not used for UMA.
   enum class StartSituation {
     UNKNOWN,
     DURING_STARTUP,
     EXISTING_PROCESS,
     NEW_PROCESS
   };
@@ skipping 135 matching lines @@
   static void RecordStartStatusAfterFailure(int failure_count,
                                             ServiceWorkerStatusCode status);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServiceWorkerMetrics);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_