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 a49c516fbfe0aa93bf76bf5736f794b19b32a5f8..3cb285883b6356d4923e75bf3169a4473f108dbe 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -295,7 +295,7 @@ void LayerTreeHostImpl::BeginCommit() {
   if (!settings_.impl_side_painting && output_surface_)
     output_surface_->ForceReclaimResources();
 
-  if (UsePendingTreeForSync())
+  if (settings_.impl_side_painting && !proxy_->CommitToActiveTree())
     CreatePendingTree();
 }
 
@@ -2072,12 +2072,6 @@ 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;
 }