cc : Add OnOpacityAnimated to effect tree

cc/layers/scrollbar_layer_unittest.cc

Index: cc/layers/scrollbar_layer_unittest.cc
diff --git a/cc/layers/scrollbar_layer_unittest.cc b/cc/layers/scrollbar_layer_unittest.cc
index d6f5a262cb6f529990b0763d9c0364ace210948c..3b71cc055f40acdd7a3b48cc2f17c32040fc8db8 100644
--- a/cc/layers/scrollbar_layer_unittest.cc
+++ b/cc/layers/scrollbar_layer_unittest.cc
@@ -572,7 +572,8 @@ TEST_F(ScrollbarLayerTest, ScrollbarLayerOpacity) {
   // This tests that activation does not change the opacity of scrollbar layer.
   LayerImpl* scrollbar_layer_impl =
       layer_tree_impl->LayerById(scrollbar_layer->id());
-  scrollbar_layer_impl->OnOpacityAnimated(0.25f);
+  layer_tree_impl->property_trees()->effect_tree.OnOpacityAnimated(
+      0.25f, scrollbar_layer_impl->effect_tree_index(), layer_tree_impl);
   host_impl->CreatePendingTree();
   layer_impl_tree_root = layer_tree_host_->CommitAndCreatePendingTree();
   layer_tree_impl = layer_impl_tree_root->layer_tree_impl();