cc : Move LayerImpl::children to test properties

cc/layers/layer_impl_unittest.cc

Index: cc/layers/layer_impl_unittest.cc
diff --git a/cc/layers/layer_impl_unittest.cc b/cc/layers/layer_impl_unittest.cc
index d521dd8858ff1f856f00a2d94f4dc57762ecf058..9f16df22e0654b0e43549475284a3257d08ac795 100644
--- a/cc/layers/layer_impl_unittest.cc
+++ b/cc/layers/layer_impl_unittest.cc
@@ -134,9 +134,9 @@ TEST(LayerImplTest, VerifyLayerChangesAreTrackedProperly) {
   root->layer_tree_impl()->ResetAllChangeTracking();
 
   root->AddChild(LayerImpl::Create(host_impl.active_tree(), 7));
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
   child->AddChild(LayerImpl::Create(host_impl.active_tree(), 8));
-  LayerImpl* grand_child = child->children()[0];
+  LayerImpl* grand_child = child->test_properties()->children[0];
   root->SetScrollClipLayer(root_clip->id());
   host_impl.active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
@@ -419,7 +419,10 @@ class LayerImplScrollTest : public testing::Test {
   }
 
   LayerImpl* layer() {
-    return host_impl_.active_tree()->root_layer()->children()[0];
+    return host_impl_.active_tree()
+        ->root_layer()
+        ->test_properties()
+        ->children[0];
   }
 
   ScrollTree* scroll_tree(LayerImpl* layer_impl) {