[BackgroundSync] Add max sync event duration to BackgroundSyncParameters

content/public/browser/background_sync_parameters.h

 // Copyright 2015 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_PUBLIC_BROWSER_BACKGROUND_SYNC_PARAMETERS_H_
 #define CONTENT_PUBLIC_BROWSER_BACKGROUND_SYNC_PARAMETERS_H_
 
 #include <stdint.h>
 
 #include "base/time/time.h"
@@ skipping 17 matching lines @@
   // time before doing so.
   base::TimeDelta initial_retry_delay;
 
   // The factor by which retry delay increases. The retry time is determined by:
   // initial_retry_delay * pow(retry_delay_factor, |attempts|-1).
   int retry_delay_factor;
 
   // The minimum time to wait before waking the browser in case the browser
   // closes mid-sync.
   base::TimeDelta min_sync_recovery_time;
+
+  // The maximum amount of time that a sync event can run for.
+  base::TimeDelta max_sync_event_duration;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BACKGROUND_SYNC_PARAMETERS_H_