Implement position: sticky updates on compositor

cc/layers/layer_impl_test_properties.h

 // 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.
 
 #ifndef CC_LAYERS_LAYER_IMPL_TEST_PROPERTIES_H_
 #define CC_LAYERS_LAYER_IMPL_TEST_PROPERTIES_H_
 
 #include <set>
 #include <vector>
 
 #include "base/memory/ptr_util.h"
 #include "cc/layers/layer_collections.h"
 #include "cc/layers/layer_position_constraint.h"
+#include "cc/layers/layer_sticky_position_constraint.h"
 #include "cc/output/filter_operations.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/geometry/point3_f.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 
 class CopyOutputRequest;
 class LayerImpl;
 
@@ skipping 14 matching lines @@
   bool hide_layer_and_subtree;
   bool opacity_can_animate;
   int num_descendants_that_draw_content;
   size_t num_unclipped_descendants;
   float opacity;
   FilterOperations filters;
   FilterOperations background_filters;
   gfx::PointF filters_origin;
   SkXfermode::Mode blend_mode;
   LayerPositionConstraint position_constraint;
+  LayerStickyPositionConstraint sticky_position_constraint;
   gfx::Point3F transform_origin;
   gfx::Transform transform;
   LayerImpl* scroll_parent;
   std::unique_ptr<std::set<LayerImpl*>> scroll_children;
   LayerImpl* clip_parent;
   std::unique_ptr<std::set<LayerImpl*>> clip_children;
   std::vector<std::unique_ptr<CopyOutputRequest>> copy_requests;
   LayerImplList children;
   LayerImpl* mask_layer;
   LayerImpl* replica_layer;
   LayerImpl* parent;
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_TEST_PROPERTIES_H_