cc: Move TryScroll from LayerImpl to LayerTreeHostImpl

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 680 matching lines @@
           data_from_ancestor.in_subtree_of_page_scale_layer;
     }
 
     node.data.scroll_clip_layer_bounds = clip_bounds;
     node.data.is_inner_viewport_scroll_layer =
         layer == data_from_ancestor.inner_viewport_scroll_layer;
     node.data.is_outer_viewport_scroll_layer =
         layer == data_from_ancestor.outer_viewport_scroll_layer;
 
     node.data.bounds = layer->bounds();
+    node.data.transform_id =
+        data_for_children->transform_tree_parent->transform_tree_index();
 
     data_for_children->scroll_tree_parent =
         data_for_children->scroll_tree->Insert(node, parent_id);
     data_for_children->main_thread_scrolling_reasons =
         node.data.main_thread_scrolling_reasons;
     data_for_children->scroll_tree_parent_created_by_uninheritable_criteria =
         scroll_node_uninheritable_criteria;
   }
 
   layer->SetScrollTreeIndex(data_for_children->scroll_tree_parent);
@@ skipping 241 matching lines @@
     const gfx::Transform& device_transform,
     PropertyTrees* property_trees) {
   BuildPropertyTreesTopLevelInternal(
       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);
 }
 
 }  // namespace cc