get cull_rect from layer_state

Author: Chris Yang

flow/layers/backdrop_filter_layer.cc

@@ -44,7 +44,7 @@ void BackdropFilterLayer::Preroll(PrerollContext* context) {
       Layer::AutoPrerollSaveLayerState::Create(context, true, bool(filter_));
   if (context->view_embedder != nullptr) {
     context->view_embedder->PushFilterToVisitedPlatformViews(
-        filter_, context->cull_rect);
+        filter_, context->state_stack.local_cull_rect());
   }
   SkRect child_paint_bounds = SkRect::MakeEmpty();
   PrerollChildren(context, &child_paint_bounds);

flow/layers/layer_state_stack.cc

@@ -656,7 +656,7 @@ void LayerStateStack::BackdropFilterEntry::apply(LayerStateStack* stack) const {
     stack->builder_->saveLayer(&bounds_, pPaint, filter_.get());
   }
   if (stack->mutators_) {
-    stack->mutators_->PushBackdropFilter(filter_);
+    stack->mutators_->PushBackdropFilter(filter_, stack->local_cull_rect());
   }
   stack->outstanding_ = {};
 }