cc: Turn impl_side_painting and use_one_copy on in LayerTreeSettings.

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 c92cb44e2e075181a0630273d7207a1521fde886..f29f3da708421ee68854a4cdfaa2dd384e5e1b80 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -233,6 +233,9 @@ LayerTreeHostImpl::LayerTreeHostImpl(
       is_likely_to_require_a_draw_(false),
       frame_timing_tracker_(FrameTimingTracker::Create(this)) {
   DCHECK(proxy_->IsImplThread());
+  DCHECK_IMPLIES(settings.impl_side_painting, task_graph_runner_);
+  DCHECK_IMPLIES(settings.use_one_copy, !settings.use_zero_copy);
+  DCHECK_IMPLIES(settings.use_zero_copy, !settings.use_one_copy);
   DidVisibilityChange(this, visible_);
   animation_registrar_->set_supports_scroll_animations(
       proxy_->SupportsImplScrolling());