cc: LayerTreeHostImpl uses element id to tick animations

cc/trees/layer_tree_host_unittest_picture.cc

Index: cc/trees/layer_tree_host_unittest_picture.cc
diff --git a/cc/trees/layer_tree_host_unittest_picture.cc b/cc/trees/layer_tree_host_unittest_picture.cc
index cbdd64173b992ac97242a338b057a72620366e81..f7a98787bcb48867456064ef39f7e45b1736db5b 100644
--- a/cc/trees/layer_tree_host_unittest_picture.cc
+++ b/cc/trees/layer_tree_host_unittest_picture.cc
@@ -250,11 +250,8 @@ class LayerTreeHostPictureTestChangeLiveTilesRectWithRecycleTree
         // Make the bottom of the layer visible.
         gfx::Transform transform;
         transform.Translate(0.f, -100000.f + 100.f);
-        impl->active_tree()
-            ->property_trees()
-            ->transform_tree.OnTransformAnimated(
-                transform, picture_impl->transform_tree_index(),
-                impl->active_tree());
+        impl->active_tree()->SetTreeLayerTransformMutated(
+            picture_impl->element_id(), transform);
         impl->SetNeedsRedraw();
         break;
       }
@@ -265,11 +262,8 @@ class LayerTreeHostPictureTestChangeLiveTilesRectWithRecycleTree
         EXPECT_FALSE(tiling->TileAt(0, 0));
 
         // Make the top of the layer visible again.
-        impl->active_tree()
-            ->property_trees()
-            ->transform_tree.OnTransformAnimated(
-                gfx::Transform(), picture_impl->transform_tree_index(),
-                impl->active_tree());
+        impl->active_tree()->SetTreeLayerTransformMutated(
+            picture_impl->element_id(), gfx::Transform());
         impl->SetNeedsRedraw();
         break;
       }