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

cc/layers/layer_impl.h

 // 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.
 
 #ifndef CC_LAYERS_LAYER_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 215 matching lines @@
 
   void SetShouldCheckBackfaceVisibility(bool should_check_backface_visibility) {
     should_check_backface_visibility_ = should_check_backface_visibility;
   }
   bool should_check_backface_visibility() const {
     return should_check_backface_visibility_;
   }
 
   bool ShowDebugBorders() const;
 
-  // These invalidate the host's render surface layer list.  The caller
-  // is responsible for calling set_needs_update_draw_properties on the tree
-  // so that its list can be recreated.
-  void ClearRenderSurfaceLayerList();
-  void SetHasRenderSurface(bool has_render_surface);
-
-  RenderSurfaceImpl* render_surface() const { return render_surface_.get(); }
+  RenderSurfaceImpl* render_surface() const;

[ajuma, 2017/02/21 15:16:50]

This needs to be renamed since it's no longer a trivial getter, but I'd like to
do the renaming in a separate patch since there are lots of callsites (~500) to
change.

 
   // The render surface which this layer draws into. This can be either owned by
   // the same layer or an ancestor of this layer.
   RenderSurfaceImpl* render_target();
   const RenderSurfaceImpl* render_target() const;
 
   DrawProperties& draw_properties() { return draw_properties_; }
   const DrawProperties& draw_properties() const { return draw_properties_; }
 
   gfx::Transform DrawTransform() const;
@@ skipping 325 matching lines @@
   bool has_will_change_transform_hint_ : 1;
   bool needs_push_properties_ : 1;
   bool scrollbars_hidden_ : 1;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_