cc: Move render surface ownership from layers to the effect tree

cc/trees/layer_tree_host_impl.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_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 870 matching lines @@
   for (LayerIterator it =
            LayerIterator::Begin(frame->render_surface_layer_list);
        it != end; ++it) {
     auto target_render_pass_id =
         it.target_render_surface_layer()->render_surface()->GetRenderPassId();
     RenderPass* target_render_pass =
         FindRenderPassById(frame->render_passes, target_render_pass_id);
 
     AppendQuadsData append_quads_data;
 
+    RenderSurfaceImpl* render_surface = it->render_surface();
     if (it.represents_target_render_surface()) {
-      if (it->render_surface()->HasCopyRequest()) {
+      if (render_surface->HasCopyRequest()) {
         active_tree()
             ->property_trees()
             ->effect_tree.TakeCopyRequestsAndTransformToSurface(
-                it->render_surface()->EffectTreeIndex(),
+                render_surface->EffectTreeIndex(),
                 &target_render_pass->copy_requests);
       }
     } else if (it.represents_contributing_render_surface() &&
-               it->render_surface()->contributes_to_drawn_surface()) {
-      it->render_surface()->AppendQuads(target_render_pass, &append_quads_data);
+               render_surface->contributes_to_drawn_surface()) {
+      render_surface->AppendQuads(target_render_pass, &append_quads_data);
     } else if (it.represents_itself() && !it->visible_layer_rect().IsEmpty()) {
       bool occluded =
           it->draw_properties().occlusion_in_content_space.IsOccluded(
               it->visible_layer_rect());
       if (!occluded && it->WillDraw(draw_mode, resource_provider_.get())) {
         DCHECK_EQ(active_tree_.get(), it->layer_tree_impl());
 
         frame->will_draw_layers.push_back(*it);
         if (it->may_contain_video())
           frame->may_contain_video = true;
@@ skipping 3186 matching lines @@
       worker_context_visibility_ =
           worker_context->CacheController()->ClientBecameVisible();
     } else {
       worker_context->CacheController()->ClientBecameNotVisible(
           std::move(worker_context_visibility_));
     }
   }
 }
 
 }  // namespace cc