sync: Buffer Protocol Events for about:sync page

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index 3b4a1fd4c79cab26368b85d47e0c0211dada8171..7e334462174696232fcc6b66d12dc8a2915b6902 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -943,6 +943,7 @@ void SyncManagerImpl::OnMigrationRequested(ModelTypeSet types) {
 }
 
 void SyncManagerImpl::OnProtocolEvent(const ProtocolEvent& event) {
+  protocol_event_buffer_.RecordProtocolEvent(event);
   FOR_EACH_OBSERVER(SyncManager::Observer, observers_,
                     OnProtocolEvent(event));
 }
@@ -1153,6 +1154,11 @@ SyncEncryptionHandler* SyncManagerImpl::GetEncryptionHandler() {
   return sync_encryption_handler_.get();
 }
 
+ScopedVector<syncer::ProtocolEvent>
+    SyncManagerImpl::GetBufferedProtocolEvents() {
+  return protocol_event_buffer_.GetBufferedProtocolEvents();
+}
+
 // static.
 int SyncManagerImpl::GetDefaultNudgeDelay() {
   return kDefaultNudgeDelayMilliseconds;