Commit History transaction when app is backgrounded on iOS

components/history/core/browser/history_backend.h

Index: components/history/core/browser/history_backend.h
diff --git a/components/history/core/browser/history_backend.h b/components/history/core/browser/history_backend.h
index 0b17e3f1e65827517142a5e8cb9df7729a366dde..6cce8af933dfcfec374f4b79548b935e8a6f9e74 100644
--- a/components/history/core/browser/history_backend.h
+++ b/components/history/core/browser/history_backend.h
@@ -191,6 +191,12 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
   // actually be deleted.
   void Closing();
 
+#if defined(OS_IOS)
+  // Persists any in-flight state, without actually shutting down the history
+  // system. This is intended for use when the application is backgrounded.
+  void PersistState();
+#endif
+
   void ClearCachedDataForContextID(ContextID context_id);
 
   // Navigation ----------------------------------------------------------------