cc: Compute animation scale on demand

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index b02c456e77dad686bce13d86edb489d8fd33ddc1..4d66004bf38568c77fac9f13fbe0fe8ab30a28f5 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -1705,23 +1705,11 @@ void Layer::OnTransformIsPotentiallyAnimatingChanged(
 
   node->data.has_potential_animation = has_potential_animation;
   if (has_potential_animation) {
-    float maximum_target_scale = 0.f;
-    node->data.local_maximum_animation_target_scale =
-        MaximumTargetScale(&maximum_target_scale) ? maximum_target_scale : 0.f;
-
-    float animation_start_scale = 0.f;
-    node->data.local_starting_animation_scale =
-        AnimationStartScale(&animation_start_scale) ? animation_start_scale
-                                                    : 0.f;
-
     node->data.has_only_translation_animations = HasOnlyTranslationTransforms();
-
-    } else {
-      node->data.local_maximum_animation_target_scale = 0.f;
-      node->data.local_starting_animation_scale = 0.f;
-      node->data.has_only_translation_animations = true;
-    }
-    property_trees->transform_tree.set_needs_update(true);
+  } else {
+    node->data.has_only_translation_animations = true;
+  }
+  property_trees->transform_tree.set_needs_update(true);
 }
 
 void Layer::OnOpacityIsCurrentlyAnimatingChanged(bool is_currently_animating) {