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

cc/trees/effect_node.h

 // 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.
 
 #ifndef CC_TREES_EFFECT_NODE_H_
 #define CC_TREES_EFFECT_NODE_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/output/filter_operations.h"
 #include "third_party/skia/include/core/SkBlendMode.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/size_f.h"
 
 namespace base {
 namespace trace_event {
 class TracedValue;
 }  // namespace trace_event
 }  // namespace base
 
 namespace cc {
 
-class RenderSurfaceImpl;
-
 struct CC_EXPORT EffectNode {
   EffectNode();
   EffectNode(const EffectNode& other);
 
   // The node index of this node in the effect tree node vector.
   int id;
   // The node index of the parent node in the effect tree node vector.
   int parent_id;
   // The layer id of the layer that owns this node.
   int owning_layer_id;
 
   float opacity;
   float screen_space_opacity;
 
   FilterOperations filters;
   FilterOperations background_filters;
   gfx::PointF filters_origin;
 
   SkBlendMode blend_mode;
 
   gfx::Vector2dF surface_contents_scale;
 
   gfx::Size unscaled_mask_target_size;
 
   bool has_render_surface;
-  RenderSurfaceImpl* render_surface;
   // Only applicable if has render surface. A true value means a clip needs to
   // be applied to the output of the surface when it is drawn onto its parent
   // surface.
   // TODO(crbug.com/504464): There is ongoing work to delay render surface
   // decision to later phase of the pipeline. This flag shall be removed and
   // computed during render surface decision.
   bool surface_is_clipped;
   bool has_copy_request;
   bool hidden_by_backface_visibility;
   bool double_sided;
@@ skipping 17 matching lines @@
   int mask_layer_id;
 
   bool operator==(const EffectNode& other) const;
 
   void AsValueInto(base::trace_event::TracedValue* value) const;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_EFFECT_NODE_H_