Transfer LayerImpl ownership to LayerTreeImpl

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 806 matching lines @@
     MarkLayerWithRenderSurfaceLayerListId(layer,
                                           current_render_surface_layer_list_id);
     descendants->push_back(layer);
   }
 
 
   // Clear the old accumulated content rect of surface.
   if (render_to_separate_surface)
     layer->render_surface()->SetAccumulatedContentRect(gfx::Rect());
 
-  for (const auto& child_layer : layer->children()) {
+  for (auto* child_layer : layer->children()) {
     CalculateRenderSurfaceLayerList(
-        child_layer.get(), property_trees, render_surface_layer_list,
-        descendants, nearest_occlusion_immune_ancestor, layer_is_drawn,
+        child_layer, property_trees, render_surface_layer_list, descendants,
+        nearest_occlusion_immune_ancestor, layer_is_drawn,
         can_render_to_separate_surface, current_render_surface_layer_list_id,
         max_texture_size);
 
     // If the child is its own render target, then it has a render surface.
-    if (child_layer->render_target() == child_layer.get() &&
+    if (child_layer->render_target() == child_layer &&
         !child_layer->render_surface()->layer_list().empty() &&
         !child_layer->render_surface()->content_rect().IsEmpty()) {
       // This child will contribute its render surface, which means
       // we need to mark just the mask layer (and replica mask layer)
       // with the id.
       MarkMasksWithRenderSurfaceLayerListId(
-          child_layer.get(), current_render_surface_layer_list_id);
-      descendants->push_back(child_layer.get());
+          child_layer, current_render_surface_layer_list_id);
+      descendants->push_back(child_layer);
     }
 
     if (child_layer->layer_or_descendant_is_drawn()) {
       bool layer_or_descendant_is_drawn = true;
       layer->set_layer_or_descendant_is_drawn(layer_or_descendant_is_drawn);
     }
   }
 
   if (render_to_separate_surface && !IsRootLayer(layer) &&
       layer->render_surface()->layer_list().empty()) {
@@ skipping 264 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