cc : Stop pushing layers from hidden subtrees at commit

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 0fac7341641d8b7ac6f982828cb4e13abf9318c2..e553fa872baf001c4d9495af9e133a213bc895cd 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -1223,6 +1223,20 @@ LayerImpl* LayerTreeImpl::LayerById(int id) const {
   return iter != layer_id_map_.end() ? iter->second : nullptr;
 }
 
+void LayerTreeImpl::SetSurfaceLayerIds(
+    const std::vector<SurfaceId>& surface_layer_ids) {
+  DCHECK(surface_layer_ids_.empty());
+  surface_layer_ids_ = surface_layer_ids;
+}
+
+const std::vector<SurfaceId>& LayerTreeImpl::SurfaceLayerIds() const {
+  return surface_layer_ids_;
+}
+
+void LayerTreeImpl::ClearSurfaceLayerIds() {
+  surface_layer_ids_.clear();
+}
+
 void LayerTreeImpl::AddLayerShouldPushProperties(LayerImpl* layer) {
   layers_that_should_push_properties_.insert(layer);
 }
@@ -1742,19 +1756,6 @@ void LayerTreeImpl::UnregisterScrollLayer(LayerImpl* layer) {
   clip_scroll_map_.erase(layer->scroll_clip_layer_id());
 }
 
-void LayerTreeImpl::AddSurfaceLayer(LayerImpl* layer) {
-  DCHECK(std::find(surface_layers_.begin(), surface_layers_.end(), layer) ==
-         surface_layers_.end());
-  surface_layers_.push_back(layer);
-}
-
-void LayerTreeImpl::RemoveSurfaceLayer(LayerImpl* layer) {
-  LayerImplList::iterator it =
-      std::find(surface_layers_.begin(), surface_layers_.end(), layer);
-  DCHECK(it != surface_layers_.end());
-  surface_layers_.erase(it);
-}
-
 static bool PointHitsRect(
     const gfx::PointF& screen_space_point,
     const gfx::Transform& local_space_to_screen_space_transform,