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

cc/trees/effect_node.cc

 // Copyright 2016 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 "base/trace_event/trace_event_argument.h"
 #include "cc/layers/layer.h"
 #include "cc/trees/effect_node.h"
 #include "cc/trees/property_tree.h"
 
 namespace cc {
 
 EffectNode::EffectNode()
     : id(EffectTree::kInvalidNodeId),
       parent_id(EffectTree::kInvalidNodeId),
       owning_layer_id(Layer::INVALID_ID),
       opacity(1.f),
       screen_space_opacity(1.f),
       blend_mode(SkBlendMode::kSrcOver),
       has_render_surface(false),
-      render_surface(nullptr),
       surface_is_clipped(false),
       has_copy_request(false),
       hidden_by_backface_visibility(false),
       double_sided(false),
       is_drawn(true),
       subtree_hidden(false),
       has_potential_filter_animation(false),
       has_potential_opacity_animation(false),
       is_currently_animating_filter(false),
       is_currently_animating_opacity(false),
@@ skipping 53 matching lines @@
   value->SetBoolean("effect_changed", effect_changed);
   value->SetInteger("num_copy_requests_in_subtree",
                     num_copy_requests_in_subtree);
   value->SetInteger("transform_id", transform_id);
   value->SetInteger("clip_id", clip_id);
   value->SetInteger("target_id", target_id);
   value->SetInteger("mask_layer_id", mask_layer_id);
 }
 
 }  // namespace cc