cc : Push layer lists instead of layer tree at commit and activation

cc/layers/scrollbar_layer_unittest.cc

Index: cc/layers/scrollbar_layer_unittest.cc
diff --git a/cc/layers/scrollbar_layer_unittest.cc b/cc/layers/scrollbar_layer_unittest.cc
index 1c3cfc12c41d5d52a3171e945da20bb17b9d5fa1..ef16f8b49088e3ff58e3d62ec71b0710b75d0e77 100644
--- a/cc/layers/scrollbar_layer_unittest.cc
+++ b/cc/layers/scrollbar_layer_unittest.cc
@@ -145,6 +145,7 @@ class ScrollbarLayerTest : public testing::Test {
     layer_tree_root->InsertChild(child2, reverse_order ? 0 : 1);
     scrollbar_layer_id_ = reverse_order ? child1->id() : child2->id();
     host->SetRootLayer(layer_tree_root);
+    host->BuildPropertyTreesForTesting();
     return host->CommitAndCreateLayerImplTree();
   }
 
@@ -165,8 +166,6 @@ TEST_F(ScrollbarLayerTest, ShouldScrollNonOverlayOnMainThread) {
       static_cast<PaintedScrollbarLayerImpl*>(
           layer_impl_tree_root->layer_tree_impl()->LayerById(
               scrollbar_layer_id_));
-  layer_impl_tree_root->layer_tree_impl()
-      ->BuildLayerListAndPropertyTreesForTesting();
   ScrollTree& scroll_tree =
       layer_impl_tree_root->layer_tree_impl()->property_trees()->scroll_tree;
   ScrollNode* scroll_node =
@@ -188,8 +187,6 @@ TEST_F(ScrollbarLayerTest, ShouldScrollNonOverlayOnMainThread) {
       layer_tree_host_.get(), std::move(scrollbar), false, false, 0, 0);
   scrollbar_layer_impl = static_cast<PaintedScrollbarLayerImpl*>(
       layer_impl_tree_root->layer_tree_impl()->LayerById(scrollbar_layer_id_));
-  layer_impl_tree_root->layer_tree_impl()
-      ->BuildLayerListAndPropertyTreesForTesting();
   scroll_tree =
       layer_impl_tree_root->layer_tree_impl()->property_trees()->scroll_tree;
   scroll_node = scroll_tree.Node(scrollbar_layer_impl->scroll_tree_index());