Force use of and cache render surface.

cc/layers/layer.h

 // Copyright 2010 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_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 250 matching lines @@
   void SetTouchActionRegion(TouchActionRegion touch_action_region);
   const TouchActionRegion& touch_action_region() const {
     return inputs_.touch_action_region;
   }
 
   void set_did_scroll_callback(
       base::Callback<void(const gfx::ScrollOffset&)> callback) {
     inputs_.did_scroll_callback = std::move(callback);
   }
 
+  void SetCacheRenderSurface(bool cache_render_surface);
+  bool cache_render_surface() const { return cache_render_surface_; }
+
   void SetForceRenderSurfaceForTesting(bool force_render_surface);
   bool force_render_surface_for_testing() const {
     return force_render_surface_for_testing_;
   }
 
   gfx::ScrollOffset CurrentScrollOffset() const {
     return inputs_.scroll_offset;
   }
 
   void SetDoubleSided(bool double_sided);
@@ skipping 350 matching lines @@
   int num_descendants_that_draw_content_;
   int transform_tree_index_;
   int effect_tree_index_;
   int clip_tree_index_;
   int scroll_tree_index_;
   int property_tree_sequence_number_;
   gfx::Vector2dF offset_to_transform_parent_;
   bool should_flatten_transform_from_property_tree_ : 1;
   bool draws_content_ : 1;
   bool should_check_backface_visibility_ : 1;
+  // Force use of and cache render surface.
+  bool cache_render_surface_ : 1;
   bool force_render_surface_for_testing_ : 1;
   bool subtree_property_changed_ : 1;
   bool may_contain_video_ : 1;
   bool needs_show_scrollbars_ : 1;
   // Whether the nodes referred to by *_tree_index_
   // "belong" to this layer. Only applicable if use_layer_lists is false.
   bool has_transform_node_ : 1;
   // This value is valid only when LayerTreeHost::has_copy_request() is true
   bool subtree_has_copy_request_ : 1;
   SkColor safe_opaque_background_color_;
   std::unique_ptr<std::set<Layer*>> scroll_children_;
 
   std::unique_ptr<std::set<Layer*>> clip_children_;
 
   // These all act like draw properties, so don't need push properties.
   gfx::Rect visible_layer_rect_;
   size_t num_unclipped_descendants_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_