Commit History transaction when app is backgrounded on iOS

components/history/core/browser/history_service.cc

Index: components/history/core/browser/history_service.cc
diff --git a/components/history/core/browser/history_service.cc b/components/history/core/browser/history_service.cc
index 05dff7d65e311d990d9da895c68266d4016fd35b..296f833aded3c5ddf8d4b8396e3a84e7f87824ae 100644
--- a/components/history/core/browser/history_service.cc
+++ b/components/history/core/browser/history_service.cc
@@ -46,6 +46,10 @@
 #include "sync/api/sync_error_factory.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
+#if defined(OS_IOS)
+#include "base/critical_closure.h"
+#endif
+
 using base::Time;
 
 namespace history {
@@ -205,6 +209,17 @@ bool HistoryService::BackendLoaded() {
   return backend_loaded_;
 }
 
+#if defined(OS_IOS)
+void HistoryService::HandleBackgrounding() {
+  if (!thread_ || !history_backend_.get())
+    return;
+
+  ScheduleTask(PRIORITY_NORMAL,
+               base::MakeCriticalClosure(base::Bind(
+                   &HistoryBackend::PersistState, history_backend_.get())));
+}
+#endif
+
 void HistoryService::ClearCachedDataForContextID(ContextID context_id) {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());