cc: DCHECK that the OutputSurface was released in ~LayerTreeHostImpl().

cc/test/layer_test_common.cc

Index: cc/test/layer_test_common.cc
diff --git a/cc/test/layer_test_common.cc b/cc/test/layer_test_common.cc
index d5c5a1c9d24314d51fb1baa1f183047b2cf71dae..aead5b8a90e405aca07db1ef1f93fba7899dbdc1 100644
--- a/cc/test/layer_test_common.cc
+++ b/cc/test/layer_test_common.cc
@@ -126,8 +126,9 @@ LayerTestCommon::LayerImplTest::LayerImplTest(const LayerTreeSettings& settings)
       layer_impl_id_(2) {
   std::unique_ptr<LayerImpl> root =
       LayerImpl::Create(host_->host_impl()->active_tree(), 1);
+  root->SetHasRenderSurface(true);
   host_->host_impl()->active_tree()->SetRootLayer(std::move(root));
-  root_layer()->SetHasRenderSurface(true);
+  host_->host_impl()->active_tree()->BuildLayerListForTesting();
   host_->host_impl()->SetVisible(true);
   host_->host_impl()->InitializeRenderer(output_surface_.get());
 
@@ -144,6 +145,7 @@ LayerTestCommon::LayerImplTest::LayerImplTest(const LayerTreeSettings& settings)
 LayerTestCommon::LayerImplTest::~LayerImplTest() {
   host_->animation_host()->RemoveAnimationTimeline(timeline_);
   timeline_ = nullptr;
+  host_->host_impl()->ReleaseOutputSurface();
 }
 
 void LayerTestCommon::LayerImplTest::CalcDrawProps(