cc: Commit directly to active tree when using single thread.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 7c509601decc9aa152a3c41ac2665322d59a64dc..915d11aff13c254d27d37ce4e75d32587f1d76c7 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -298,7 +298,7 @@ void LayerTreeHostImpl::BeginCommit() {
   if (!settings_.impl_side_painting && output_surface_)
     output_surface_->ForceReclaimResources();
 
-  if (UsePendingTreeForSync())
+  if (settings_.impl_side_painting && !proxy_->CommitToActiveTree())
     CreatePendingTree();
 }
 
@@ -2053,12 +2053,6 @@ void LayerTreeHostImpl::DestroyTileManager() {
   single_thread_synchronous_task_graph_runner_ = nullptr;
 }
 
-bool LayerTreeHostImpl::UsePendingTreeForSync() const {
-  // In impl-side painting, synchronize to the pending tree so that it has
-  // time to raster before being displayed.
-  return settings_.impl_side_painting;
-}
-
 bool LayerTreeHostImpl::IsSynchronousSingleThreaded() const {
   return !proxy_->HasImplThread() && !settings_.single_thread_proxy_scheduler;
 }