Include the source_to_parent offset when removing offset applied by main.

cc/trees/property_tree.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 <stddef.h>
 
 #include <set>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 456 matching lines @@
     float top_delta = std::max<float>(
         0,
         top_limit - constraint.scroll_container_relative_sticky_box_rect.y());
     float available_space = std::max<float>(
         0, constraint.scroll_container_relative_containing_block_rect.bottom() -
                constraint.scroll_container_relative_sticky_box_rect.bottom());
     if (top_delta > available_space)
       top_delta = available_space;
     sticky_offset.set_y(sticky_offset.y() + top_delta);
   }
-  return sticky_offset - layer_offset -
+  return sticky_offset - layer_offset - node->source_to_parent -
          constraint.scroll_container_relative_sticky_box_rect
              .OffsetFromOrigin();
 }
 
 void TransformTree::UpdateLocalTransform(TransformNode* node) {
   gfx::Transform transform = node->post_local;
   if (NeedsSourceToParentUpdate(node)) {
     gfx::Transform to_parent;
     ComputeTranslation(node->source_node_id, node->parent_id, &to_parent);
     gfx::Vector2dF unsnapping;
@@ skipping 1732 matching lines @@
 
   const EffectNode* effect_node = effect_tree.Node(effect_id);
 
   bool success = GetFromTarget(transform_id, effect_id, transform);
   transform->Scale(effect_node->surface_contents_scale.x(),
                    effect_node->surface_contents_scale.y());
   return success;
 }
 
 }  // namespace cc