cc: Move LayerImpl::AddChild and RemoveChild to LayerImplTestProperties

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 11 matching lines @@
       num_unclipped_descendants(0),
       opacity(1.f),
       scroll_parent(nullptr),
       clip_parent(nullptr),
       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));
+}
+
+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());
+}
+
 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