Add the ability to schedule any pending lossy prefs to be written.

base/prefs/pref_service.cc

Index: base/prefs/pref_service.cc
diff --git a/base/prefs/pref_service.cc b/base/prefs/pref_service.cc
index 6e1d58ca0f163eff22c4048e6691ba3192bec884..a9749b2ba836f6423c8d1696c038ae0b5e139cf0 100644
--- a/base/prefs/pref_service.cc
+++ b/base/prefs/pref_service.cc
@@ -106,6 +106,11 @@ void PrefService::CommitPendingWrite() {
   user_pref_store_->CommitPendingWrite();
 }
 
+void PrefService::SchedulePendingLossyWrites() {
+  DCHECK(CalledOnValidThread());
+  user_pref_store_->SchedulePendingLossyWrites();
+}
+
 bool PrefService::GetBoolean(const std::string& path) const {
   DCHECK(CalledOnValidThread());