cc: Stop creating unused 0 property tree nodes other than transform

cc/layers/render_surface_impl.cc

Index: cc/layers/render_surface_impl.cc
diff --git a/cc/layers/render_surface_impl.cc b/cc/layers/render_surface_impl.cc
index f03d3cc434837b3d083d839db6845dcc314b095e..b36919ece14ed4d7b613349bc07f83fe385c050c 100644
--- a/cc/layers/render_surface_impl.cc
+++ b/cc/layers/render_surface_impl.cc
@@ -45,10 +45,7 @@ RenderSurfaceImpl* RenderSurfaceImpl::render_target() {
       owning_layer_->layer_tree_impl()->property_trees()->effect_tree;
   EffectNode* node = effect_tree.Node(EffectTreeIndex());
   EffectNode* target_node = effect_tree.Node(node->data.target_id);
-  if (target_node->id != 0)
-    return target_node->data.render_surface;
-  else
-    return this;
+  return target_node->data.render_surface;
 }
 
 const RenderSurfaceImpl* RenderSurfaceImpl::render_target() const {
@@ -56,10 +53,7 @@ const RenderSurfaceImpl* RenderSurfaceImpl::render_target() const {
       owning_layer_->layer_tree_impl()->property_trees()->effect_tree;
   const EffectNode* node = effect_tree.Node(EffectTreeIndex());
   const EffectNode* target_node = effect_tree.Node(node->data.target_id);
-  if (target_node->id != 0)
-    return target_node->data.render_surface;
-  else
-    return this;
+  return target_node->data.render_surface;
 }
 
 RenderSurfaceImpl::DrawProperties::DrawProperties() {