[Offline Pages] Pick correct request when resuming.

components/offline_pages/core/background/request_coordinator.h

Index: components/offline_pages/core/background/request_coordinator.h
diff --git a/components/offline_pages/core/background/request_coordinator.h b/components/offline_pages/core/background/request_coordinator.h
index 770cae3a8f1cd7595a44091e120efbc01741d914..ea86023098cdfb38935be8cc8490285707d3748b 100644
--- a/components/offline_pages/core/background/request_coordinator.h
+++ b/components/offline_pages/core/background/request_coordinator.h
@@ -452,6 +452,8 @@ class RequestCoordinator : public KeyedService,
   base::OneShotTimer watchdog_timer_;
   // Used for potential immediate processing when we get network connection.
   std::unique_ptr<ConnectionNotifier> connection_notifier_;
+  // Used to track whether we have a prioritized request.
+  std::vector<int64_t> prioritized_requests_;
   // Allows us to pass a weak pointer to callbacks.
   base::WeakPtrFactory<RequestCoordinator> weak_ptr_factory_;