cc : Compute subtree has copy requests before property tree building

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 79 matching lines @@
   Layer* child_at(size_t index) { return inputs_.children[index].get(); }
 
   // This requests the layer and its subtree be rendered and given to the
   // callback. If the copy is unable to be produced (the layer is destroyed
   // first), then the callback is called with a nullptr/empty result. If the
   // request's source property is set, any prior uncommitted requests having the
   // same source will be aborted.
   void RequestCopyOfOutput(std::unique_ptr<CopyOutputRequest> request);
   bool HasCopyRequest() const { return !inputs_.copy_requests.empty(); }
 
+  void SetSubtreeHasCopyRequest(bool subtree_has_copy_request);
+  bool SubtreeHasCopyRequest() const;
+
   void TakeCopyRequests(
       std::vector<std::unique_ptr<CopyOutputRequest>>* requests);
 
   virtual void SetBackgroundColor(SkColor background_color);
   SkColor background_color() const { return inputs_.background_color; }
   void SetSafeOpaqueBackgroundColor(SkColor background_color);
   // If contents_opaque(), return an opaque color else return a
   // non-opaque color.  Tries to return background_color(), if possible.
   SkColor SafeOpaqueBackgroundColor() const;
 
@@ skipping 284 matching lines @@
   void set_visible_layer_rect(const gfx::Rect& rect) {
     visible_layer_rect_ = rect;
   }
 
   // This is for tracking damage.
   void SetSubtreePropertyChanged();
   bool subtree_property_changed() const { return subtree_property_changed_; }
 
   void SetMayContainVideo(bool yes);
 
-  int num_copy_requests_in_target_subtree();
+  bool has_copy_requests_in_target_subtree();
 
   void SetElementId(ElementId id);
   ElementId element_id() const { return inputs_.element_id; }
 
   void SetMutableProperties(uint32_t properties);
   uint32_t mutable_properties() const { return inputs_.mutable_properties; }
 
   bool HasTickingAnimationForTesting() const;
 
   void SetHasWillChangeTransformHint(bool has_will_change);
@@ skipping 205 matching lines @@
   gfx::Vector2dF offset_to_transform_parent_;
   bool should_flatten_transform_from_property_tree_ : 1;
   bool draws_content_ : 1;
   bool use_local_transform_for_backface_visibility_ : 1;
   bool should_check_backface_visibility_ : 1;
   bool force_render_surface_for_testing_ : 1;
   bool subtree_property_changed_ : 1;
   bool may_contain_video_ : 1;
   bool is_scroll_clip_layer_ : 1;
   bool needs_show_scrollbars_ : 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_;
 
   PaintProperties paint_properties_;
 
   // 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_