Implement a Mojo service for Background Fetch

content/browser/storage_partition_impl.h

Index: content/browser/storage_partition_impl.h
diff --git a/content/browser/storage_partition_impl.h b/content/browser/storage_partition_impl.h
index 92b46dd008696661b08125aa2ff0293629024b0d..9157d5b2cf53808698bb0df23e04be08fb6eab47 100644
--- a/content/browser/storage_partition_impl.h
+++ b/content/browser/storage_partition_impl.h
@@ -16,6 +16,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/appcache/chrome_appcache_service.h"
+#include "content/browser/background_fetch/background_fetch_context.h"
 #include "content/browser/background_sync/background_sync_context.h"
 #include "content/browser/bluetooth/bluetooth_allowed_devices_map.h"
 #include "content/browser/broadcast_channel/broadcast_channel_provider.h"
@@ -78,6 +79,7 @@ class CONTENT_EXPORT  StoragePartitionImpl
   PlatformNotificationContextImpl* GetPlatformNotificationContext() override;
   void ClearBluetoothAllowedDevicesMapForTesting() override;
 
+  BackgroundFetchContext* GetBackgroundFetchContext();
   BackgroundSyncContext* GetBackgroundSyncContext();
   PaymentAppContextImpl* GetPaymentAppContext();
   BroadcastChannelProvider* GetBroadcastChannelProvider();
@@ -220,6 +222,7 @@ class CONTENT_EXPORT  StoragePartitionImpl
   scoped_refptr<storage::SpecialStoragePolicy> special_storage_policy_;
   scoped_refptr<HostZoomLevelContext> host_zoom_level_context_;
   scoped_refptr<PlatformNotificationContextImpl> platform_notification_context_;
+  scoped_refptr<BackgroundFetchContext> background_fetch_context_;
   scoped_refptr<BackgroundSyncContext> background_sync_context_;
   scoped_refptr<PaymentAppContextImpl> payment_app_context_;
   scoped_refptr<BroadcastChannelProvider> broadcast_channel_provider_;