cc : Delete unused properties in effect node

cc/trees/layer_tree_host_common.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host_common.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 628 matching lines @@
     }
     layer->render_surface()->SetNearestOcclusionImmuneAncestor(
         nearest_occlusion_immune_ancestor);
     layer->ClearRenderSurfaceLayerList();
 
     render_surface_layer_list->push_back(layer);
 
     descendants = &(layer->render_surface()->layer_list());
   }
 
-  size_t descendants_size = descendants->size();
-
   bool layer_should_be_skipped = !draw_property_utils::LayerNeedsUpdate(
       layer, layer_is_drawn, property_trees->transform_tree);
   if (!layer_should_be_skipped) {
     MarkLayerWithRenderSurfaceLayerListId(layer,
                                           current_render_surface_layer_list_id);
     descendants->push_back(layer);
   }
 
 
   // Clear the old accumulated content rect of surface.
@@ skipping 63 matching lines @@
   } else {
     // The root layer's surface content rect is always the entire viewport.
     gfx::Rect viewport =
         gfx::ToEnclosingRect(property_trees->clip_tree.ViewportClip());
     layer->render_surface()->SetContentRect(viewport);
   }
 
   if (render_to_separate_surface && !IsRootLayer(layer) &&
       layer->render_surface()->DrawableContentRect().IsEmpty()) {
     RemoveSurfaceForEarlyExit(layer, render_surface_layer_list);
-    return;
-  }
-
-  // If neither this layer nor any of its children were added, early out.
-  if (descendants_size == descendants->size()) {
-    DCHECK(!render_to_separate_surface || IsRootLayer(layer));
-    return;
   }
 }
 
 static void ComputeMaskLayerDrawProperties(const LayerImpl* layer,
                                            LayerImpl* mask_layer) {
   DrawProperties& mask_layer_draw_properties = mask_layer->draw_properties();
   mask_layer_draw_properties.visible_layer_rect = gfx::Rect(layer->bounds());
   mask_layer_draw_properties.target_space_transform =
       layer->draw_properties().target_space_transform;
   mask_layer_draw_properties.screen_space_transform =
@@ skipping 200 matching lines @@
 
 PropertyTrees* GetPropertyTrees(Layer* layer) {
   return layer->layer_tree_host()->property_trees();
 }
 
 PropertyTrees* GetPropertyTrees(LayerImpl* layer) {
   return layer->layer_tree_impl()->property_trees();
 }
 
 }  // namespace cc