59       back_ = front_;  in zone_()
141   Chunk* back_ = nullptr;  variable
221     if (list->back_ == nullptr) return End(list);  in Begin()
222     if (list->back_->position_ == 0) {  in Begin()
223       if (list->back_->previous_ != nullptr) {  in Begin()
224         return ZoneChunkListIterator(list->back_->previous_,  in Begin()
225                                      list->back_->previous_->capacity_ - 1);  in Begin()
230     return ZoneChunkListIterator(list->back_, list->back_->position_ - 1);  in Begin()
238     if (list->back_ == nullptr) return Begin(list);  in End()
240     DCHECK_LE(list->back_->position_, list->back_->capacity_);  in End()
241     if (list->back_->position_ == list->back_->capacity_) {  in End()
242       return ZoneChunkListIterator(list->back_->next_, 0);  in End()
245     return ZoneChunkListIterator(list->back_, list->back_->position_);  in End()
287   if (back_->position_ == 0) {  in back()
288     return back_->previous_->items()[back_->previous_->position_ - 1];  in back()
290     return back_->items()[back_->position_ - 1];  in back()
296   if (back_ == nullptr) {  in push_back()
298     back_ = front_;  in push_back()
301   DCHECK_LE(back_->position_, back_->capacity_);  in push_back()
302   if (back_->position_ == back_->capacity_) {  in push_back()
303     if (back_->next_ == nullptr) {  in push_back()
304       Chunk* chunk = NewChunk(Min(back_->capacity_ << 1, kMaxChunkCapacity));  in push_back()
305       back_->next_ = chunk;  in push_back()
306       chunk->previous_ = back_;  in push_back()
308     back_ = back_->next_;  in push_back()
310   back_->items()[back_->position_] = item;  in push_back()
311   ++back_->position_;  in push_back()
313   DCHECK_LE(back_->position_, back_->capacity_);  in push_back()
319   if (back_->position_ == 0) {  in pop_back()
320     back_ = back_->previous_;  in pop_back()
322   --back_->position_;  in pop_back()
333     back_ = chunk;  in push_front()
366   back_ = seek_result.chunk_;  in Rewind()