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

cc/test/layer_test_common.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/test/layer_test_common.h"
 
 #include <stddef.h>
 
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_id_provider.h"
@@ skipping 126 matching lines @@
   // Create impl-side instance.
   host_->animation_host()->PushPropertiesTo(
       host_->host_impl()->animation_host());
   timeline_impl_ =
       host_->host_impl()->animation_host()->GetTimelineById(timeline_id);
 }
 
 LayerTestCommon::LayerImplTest::~LayerImplTest() {
   host_->animation_host()->RemoveAnimationTimeline(timeline_);
   timeline_ = nullptr;
+  host_->host_impl()->ReleaseOutputSurface();
 }
 
 void LayerTestCommon::LayerImplTest::CalcDrawProps(
     const gfx::Size& viewport_size) {
   LayerImplList layer_list;
   LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
       root_layer_for_testing(), viewport_size, &layer_list);
   LayerTreeHostCommon::CalculateDrawPropertiesForTesting(&inputs);
 }
 
@@ skipping 48 matching lines @@
 }
 
 void EmptyCopyOutputCallback(std::unique_ptr<CopyOutputResult> result) {}
 
 void LayerTestCommon::LayerImplTest::RequestCopyOfOutput() {
   root_layer_for_testing()->test_properties()->copy_requests.push_back(
       CopyOutputRequest::CreateRequest(base::Bind(&EmptyCopyOutputCallback)));
 }
 
 }  // namespace cc