cc: Move LayerImpl::AddChild and RemoveChild to LayerImplTestProperties

third_party/WebKit/Source/platform/graphics/CompositorMutableStateTest.cpp

 // 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 "platform/graphics/CompositorMutableState.h"
 
 #include "base/message_loop/message_loop.h"
 #include "cc/test/fake_impl_task_runner_provider.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/fake_output_surface.h"
@@ skipping 95 matching lines @@
     // In this test, there is a layer with an element id and mutable properties.
     // In this case, we should get a valid mutable state for this element id that
     // has a real effect on the corresponding layer.
     std::unique_ptr<LayerImpl> root = LayerImpl::Create(hostImpl().active_tree(), 42);
 
     std::unique_ptr<LayerImpl> scopedLayer =
         LayerImpl::Create(hostImpl().active_tree(), 11);
     LayerImpl* layer = scopedLayer.get();
     layer->SetScrollClipLayer(root->id());
 
-    root->AddChild(std::move(scopedLayer));
+    root->test_properties()->AddChild(std::move(scopedLayer));
 
     SetLayerPropertiesForTesting(layer);
     layer->SetElementId(12);
     root->SetElementId(layer->element_id());
 
     root->SetMutableProperties(CompositorMutableProperty::kOpacity | CompositorMutableProperty::kTransform);
     layer->SetMutableProperties(CompositorMutableProperty::kScrollLeft | CompositorMutableProperty::kScrollTop);
 
     hostImpl().SetViewportSize(layer->bounds());
     hostImpl().active_tree()->SetRootLayer(std::move(root));
@@ skipping 30 matching lines @@
     EXPECT_TRUE(mutation.isScrollLeftMutated());
     EXPECT_TRUE(mutation.isScrollTopMutated());
 
     EXPECT_EQ(0.5, mutation.opacity());
     EXPECT_EQ(zero.ToString(), gfx::Transform(mutation.transform()).ToString());
     EXPECT_EQ(1.0, mutation.scrollLeft());
     EXPECT_EQ(1.0, mutation.scrollTop());
 }
 
 } // namespace blink