Commit History transaction when app is backgrounded on iOS

components/history/core/browser/history_backend.cc

Index: components/history/core/browser/history_backend.cc
diff --git a/components/history/core/browser/history_backend.cc b/components/history/core/browser/history_backend.cc
index c35e8c40923ec7034039b733ac5cb1552acc159d..a1fdba9652e622ae13848bb9c8f637029e95f0ab 100644
--- a/components/history/core/browser/history_backend.cc
+++ b/components/history/core/browser/history_backend.cc
@@ -44,6 +44,10 @@
 #include "url/gurl.h"
 #include "url/url_constants.h"
 
+#if defined(OS_IOS)
+#include "base/ios/scoped_critical_action.h"
+#endif
+
 using base::Time;
 using base::TimeDelta;
 using base::TimeTicks;
@@ -260,6 +264,12 @@ void HistoryBackend::Closing() {
   delegate_.reset();
 }
 
+#if defined(OS_IOS)
+void HistoryBackend::PersistState() {
+  Commit();
+}
+#endif
+
 void HistoryBackend::ClearCachedDataForContextID(ContextID context_id) {
   tracker_.ClearCachedDataForContextID(context_id);
 }
@@ -2168,6 +2178,12 @@ void HistoryBackend::Commit() {
   if (!db_)
     return;
 
+#if defined(OS_IOS)
+  // Attempts to get the application running long enough to commit the database
+  // transaction if it is currently being backgrounded.
+  base::ios::ScopedCriticalAction scoped_critical_action;
+#endif
+
   // Note that a commit may not actually have been scheduled if a caller
   // explicitly calls this instead of using ScheduleCommit. Likewise, we
   // may reset the flag written by a pending commit. But this is OK! It