Compute and include the offset of the sticky box to its enclosing composited layer.

cc/layers/layer_sticky_position_constraint.cc

 // Copyright 2013 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/layers/layer_sticky_position_constraint.h"
 #include "cc/proto/gfx_conversions.h"
 #include "cc/proto/layer_sticky_position_constraint.pb.h"
 
 namespace cc {
 
@@ skipping 12 matching lines @@
     const LayerStickyPositionConstraint& other)
     : is_sticky(other.is_sticky),
       is_anchored_left(other.is_anchored_left),
       is_anchored_right(other.is_anchored_right),
       is_anchored_top(other.is_anchored_top),
       is_anchored_bottom(other.is_anchored_bottom),
       left_offset(other.left_offset),
       right_offset(other.right_offset),
       top_offset(other.top_offset),
       bottom_offset(other.bottom_offset),
+      parent_relative_sticky_box_offset(
+          other.parent_relative_sticky_box_offset),
       scroll_container_relative_sticky_box_rect(
           other.scroll_container_relative_sticky_box_rect),
       scroll_container_relative_containing_block_rect(
           other.scroll_container_relative_containing_block_rect) {}
 
 void LayerStickyPositionConstraint::ToProtobuf(
     proto::LayerStickyPositionConstraint* proto) const {
   proto->set_is_sticky(is_sticky);
   proto->set_is_anchored_left(is_anchored_left);
   proto->set_is_anchored_right(is_anchored_right);
@@ skipping 43 matching lines @@
          scroll_container_relative_containing_block_rect ==
              other.scroll_container_relative_containing_block_rect;
 }
 
 bool LayerStickyPositionConstraint::operator!=(
     const LayerStickyPositionConstraint& other) const {
   return !(*this == other);
 }
 
 }  // namespace cc