cc : Compute subtree has copy requests before property tree building

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index bf5520e2a39bc5787ced71b5832aaaf1b1e681d3..9ecdc776eadcaeaf1c5468fb355856a6d9fed88d 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -341,6 +341,9 @@ class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
                     bool* content_is_suitable_for_gpu);
   bool in_paint_layer_contents() const { return in_paint_layer_contents_; }
 
+  void SetHasCopyRequest(bool has_copy_request);
+  bool has_copy_request() const { return has_copy_request_; }
+
   void AddLayerShouldPushProperties(Layer* layer);
   void RemoveLayerShouldPushProperties(Layer* layer);
   std::unordered_set<Layer*>& LayersThatShouldPushProperties();
@@ -611,6 +614,11 @@ class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
   bool in_paint_layer_contents_ = false;
   bool in_update_property_trees_ = false;
 
+  // This is true if atleast one layer in the layer tree has a copy request. We
+  // use this bool to decide whether we need to compute subtree has copy request
+  // for every layer during property tree building.
+  bool has_copy_request_ = false;
+
   MutatorHost* mutator_host_;
 
   std::vector<std::pair<sk_sp<const SkImage>, base::Callback<void(bool)>>>