Add UMA data for memory pressure warning received for sync

components/sync_driver/sync_prefs.cc

Index: components/sync_driver/sync_prefs.cc
diff --git a/components/sync_driver/sync_prefs.cc b/components/sync_driver/sync_prefs.cc
index 89f5320e0bdcda0cff731648e55510ea875e7859..8073d63569c5b0bb7c0d9357826cef2df71904a3 100644
--- a/components/sync_driver/sync_prefs.cc
+++ b/components/sync_driver/sync_prefs.cc
@@ -82,6 +82,10 @@ void SyncPrefs::RegisterProfilePrefs(
   registry->RegisterIntegerPref(prefs::kSyncRemainingRollbackTries, 0);
 
   registry->RegisterBooleanPref(prefs::kSyncPassphrasePrompted, false);
+
+  registry->RegisterIntegerPref(prefs::kSyncMemoryPressureReceivings, -1);
+
+  registry->RegisterBooleanPref(prefs::kSyncShutdownUnnormal, true);
 }
 
 void SyncPrefs::AddSyncPrefObserver(SyncPrefObserver* sync_pref_observer) {
@@ -442,4 +446,22 @@ void SyncPrefs::SetPassphrasePrompted(bool value) {
   pref_service_->SetBoolean(prefs::kSyncPassphrasePrompted, value);
 }
 
+int SyncPrefs::GetMemoryPressure() const {
+  return pref_service_->GetInteger(prefs::kSyncMemoryPressureReceivings);
+}
+
+void SyncPrefs::SetMemoryPressure(int value) {
+  pref_service_->SetInteger(prefs::kSyncMemoryPressureReceivings, value);
+}
+
+bool SyncPrefs::IsPreviousCrashed() const {
+  return pref_service_->GetBoolean(prefs::kSyncShutdownUnnormal);
+}
+
+void SyncPrefs::SetCurrentShutdown(bool value) {
+  pref_service_->SetBoolean(prefs::kSyncShutdownUnnormal, value);
+}
+
 }  // namespace sync_driver
+
+