cc : Use effect id to decide if surface contents scale should be applied

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 290465876ed25af18fb6329567fc6ed86a295920..7c4adcb879f5bd13328f7b82960ce302d76303c6 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -1005,7 +1005,7 @@ bool LayerTreeImpl::UpdateDrawProperties(bool update_lcd_text) {
               it->render_surface()->TransformTreeIndex(),
               occlusion_surface->EffectTreeIndex(), &draw_transform);
           // We don't have to apply surface contents scale when target is root.
-          if (occlusion_surface->TransformTreeIndex() != 0) {
+          if (occlusion_surface->EffectTreeIndex() != 1) {
             const EffectNode* occlusion_effect_node =
                 property_trees()->effect_tree.Node(
                     occlusion_surface->EffectTreeIndex());