Implement CSS: scroll-boundary-behavior

cc/trees/property_tree_builder.cc

 // Copyright 2014 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.
 
 #include "cc/trees/property_tree_builder.h"
 
 #include <stddef.h>
 
 #include <map>
 #include <set>
@@ skipping 971 matching lines @@
 }
 
 static inline bool UserScrollableVertical(Layer* layer) {
   return layer->user_scrollable_vertical();
 }
 
 static inline bool UserScrollableVertical(LayerImpl* layer) {
   return layer->test_properties()->user_scrollable_vertical;
 }
 
+static inline ScrollBoundaryBehavior GetScrollBoundaryBehavior(Layer* layer) {
+  return layer->scroll_boundary_behavior();
+}
+
+static inline ScrollBoundaryBehavior GetScrollBoundaryBehavior(
+    LayerImpl* layer) {
+  return layer->test_properties()->scroll_boundary_behavior;
+}
+
 template <typename LayerType>
 void SetHasTransformNode(LayerType* layer, bool val) {
   layer->SetHasTransformNode(val);
 }
 
 template <typename LayerType>
 void AddScrollNodeIfNeeded(
     const DataForRecursion<LayerType>& data_from_ancestor,
     LayerType* layer,
     DataForRecursion<LayerType>* data_for_children) {
@@ skipping 40 matching lines @@
 
     node.bounds = layer->bounds();
     node.container_bounds = layer->scroll_container_bounds();
     node.offset_to_transform_parent = layer->offset_to_transform_parent();
     node.should_flatten = layer->should_flatten_transform_from_property_tree();
     node.user_scrollable_horizontal = UserScrollableHorizontal(layer);
     node.user_scrollable_vertical = UserScrollableVertical(layer);
     node.element_id = layer->element_id();
     node.transform_id =
         data_for_children->transform_tree_parent->transform_tree_index();
+    node.scroll_boundary_behavior = GetScrollBoundaryBehavior(layer);
 
     node_id =
         data_for_children->property_trees->scroll_tree.Insert(node, parent_id);
     data_for_children->scroll_tree_parent = node_id;
     data_for_children->main_thread_scrolling_reasons =
         node.main_thread_scrolling_reasons;
     data_for_children->scroll_tree_parent_created_by_uninheritable_criteria =
         scroll_node_uninheritable_criteria;
     // For animation subsystem purposes, if this layer has a compositor element
     // id, we build a map from that id to this scroll node.
@@ skipping 303 matching lines @@
       root_layer, page_scale_layer, inner_viewport_scroll_layer,
       outer_viewport_scroll_layer, overscroll_elasticity_layer,
       elastic_overscroll, page_scale_factor, device_scale_factor, viewport,
       device_transform, property_trees, color);
   property_trees->effect_tree.CreateOrReuseRenderSurfaces(
       &render_surfaces, root_layer->layer_tree_impl());
   property_trees->ResetCachedData();
 }
 
 }  // namespace cc