cc: Compute animation scale on demand

cc/layers/picture_layer_impl_unittest.cc

Index: cc/layers/picture_layer_impl_unittest.cc
diff --git a/cc/layers/picture_layer_impl_unittest.cc b/cc/layers/picture_layer_impl_unittest.cc
index bff36d6ff1c6e0cc74ad04e134a2815aca5a7fcd..1272add7f9e90be56810e6d190d15e5c133ffd5b 100644
--- a/cc/layers/picture_layer_impl_unittest.cc
+++ b/cc/layers/picture_layer_impl_unittest.cc
@@ -169,10 +169,9 @@ class PictureLayerImplTest : public TestLayerTreeHostBase {
     layer->draw_properties().screen_space_transform = scale_transform;
     layer->set_is_drawn_render_surface_layer_list_member(true);
     DCHECK_EQ(layer->GetIdealContentsScale(), ideal_contents_scale);
-    layer->draw_properties().maximum_animation_contents_scale =
-        maximum_animation_contents_scale;
-    layer->draw_properties().starting_animation_contents_scale =
-        starting_animation_contents_scale;
+    layer->layer_tree_impl()->property_trees()->SetAnimationScalesForTesting(
+        layer->transform_tree_index(), maximum_animation_contents_scale,
+        starting_animation_contents_scale);
     layer->draw_properties().screen_space_transform_is_animating =
         animating_transform_to_screen;
   }