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 224b38b8ae7523eb5ccbcc0a593e6dbb5a8c16b6..7350066a586f54dec2af102e2452a113e21e79d4 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -946,6 +946,7 @@ void SyncManagerImpl::OnMigrationRequested(ModelTypeSet types) {
 }
 
 void SyncManagerImpl::OnProtocolEvent(const ProtocolEvent& event) {
+  protocol_event_buffer_.RecordProtocolEvent(event);
   FOR_EACH_OBSERVER(SyncManager::Observer, observers_,
                     OnProtocolEvent(event));
 }
@@ -1161,6 +1162,11 @@ SyncEncryptionHandler* SyncManagerImpl::GetEncryptionHandler() {
   return sync_encryption_handler_.get();
 }
 
+ScopedVector<syncer::ProtocolEvent>
+    SyncManagerImpl::GetBufferedProtocolEvents() {
+  return protocol_event_buffer_.GetBufferedProtocolEvents();
+}
+
 // static.
 int SyncManagerImpl::GetDefaultNudgeDelay() {
   return kDefaultNudgeDelayMilliseconds;