Implement position: sticky updates on compositor

cc/trees/transform_node.cc

 // Copyright 2016 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 "base/trace_event/trace_event_argument.h"
 #include "cc/base/math_util.h"
 #include "cc/proto/gfx_conversions.h"
 #include "cc/proto/property_tree.pb.h"
 #include "cc/trees/transform_node.h"
 #include "ui/gfx/geometry/point3_f.h"
 
 namespace cc {
 
 TransformNode::TransformNode()
     : id(-1),
       parent_id(-1),
       owner_id(-1),
+      sticky_position_constraint_id(-1),
       source_node_id(-1),
       sorting_context_id(0),
       needs_local_transform_update(true),
       node_and_ancestors_are_animated_or_invertible(true),
       is_invertible(true),
       ancestors_are_invertible(true),
       has_potential_animation(false),
       is_currently_animating(false),
       to_screen_is_potentially_animated(false),
       has_only_translation_animations(true),
@@ skipping 237 matching lines @@
     const proto::TransformCachedNodeData& proto) {
   from_target = ProtoToTransform(proto.from_target());
   to_target = ProtoToTransform(proto.to_target());
   from_screen = ProtoToTransform(proto.from_screen());
   to_screen = ProtoToTransform(proto.to_screen());
   target_id = proto.target_id();
   content_target_id = proto.content_target_id();
 }
 
 }  // namespace cc