cc: Change how/when we build layer list/property tress in tests.

cc/layers/layer_impl_test_properties.cc

 // Copyright 2016 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/layers/layer_impl_test_properties.h"
 
 #include "cc/layers/layer_impl.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/trees/layer_tree_impl.h"
 
@@ skipping 15 matching lines @@
       mask_layer(nullptr),
       replica_layer(nullptr),
       parent(nullptr) {}
 
 LayerImplTestProperties::~LayerImplTestProperties() {}
 
 void LayerImplTestProperties::AddChild(std::unique_ptr<LayerImpl> child) {
   child->test_properties()->parent = owning_layer;
   children.push_back(child.get());
   owning_layer->layer_tree_impl()->AddLayer(std::move(child));
+  owning_layer->layer_tree_impl()->BuildLayerListForTesting();
 }
 
 std::unique_ptr<LayerImpl> LayerImplTestProperties::RemoveChild(
     LayerImpl* child) {
   auto it = std::find(children.begin(), children.end(), child);
   if (it != children.end())
     children.erase(it);
   owning_layer->layer_tree_impl()->property_trees()->RemoveIdFromIdToIndexMaps(
       child->id());
-  return owning_layer->layer_tree_impl()->RemoveLayer(child->id());
+  auto layer = owning_layer->layer_tree_impl()->RemoveLayer(child->id());
+  owning_layer->layer_tree_impl()->BuildLayerListForTesting();
+  return layer;
 }
 
 void LayerImplTestProperties::SetMaskLayer(std::unique_ptr<LayerImpl> mask) {
   if (mask_layer)
     owning_layer->layer_tree_impl()->RemoveLayer(mask_layer->id());
   mask_layer = mask.get();
   if (mask)
     owning_layer->layer_tree_impl()->AddLayer(std::move(mask));
 }
 
 void LayerImplTestProperties::SetReplicaLayer(
     std::unique_ptr<LayerImpl> replica) {
   if (replica_layer) {
     replica_layer->test_properties()->SetMaskLayer(nullptr);
     owning_layer->layer_tree_impl()->RemoveLayer(replica_layer->id());
   }
   replica_layer = replica.get();
   if (replica) {
     replica->test_properties()->parent = owning_layer;
     owning_layer->layer_tree_impl()->AddLayer(std::move(replica));
   }
 }
 
 }  // namespace cc