Overscroll and Elasticity for views::ScrollView

cc/trees/transform_node.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_TREES_TRANSFORM_NODE_H_
 #define CC_TREES_TRANSFORM_NODE_H_
 
 #include "cc/base/cc_export.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/scroll_offset.h"
@@ skipping 98 matching lines @@
   // layer scale factor should include the page scale factor.
   bool in_subtree_of_page_scale_layer : 1;
 
   // We need to track changes to to_screen transform to compute the damage rect.
   bool transform_changed : 1;
 
   // TODO(vollick): will be moved when accelerated effects are implemented.
   float post_local_scale_factor;
 
   // TODO(vollick): will be moved when accelerated effects are implemented.
-  gfx::ScrollOffset scroll_offset;
+  gfx::ScrollOffset scroll_offset_with_overscroll;
 
   // This value stores the snapped amount whenever we snap. If the snap is due
   // to a scroll, we need it to calculate fixed-pos elements adjustment, even
   // otherwise we may need it to undo the snapping next frame.
   gfx::Vector2dF snap_amount;
 
   // TODO(vollick): will be moved when accelerated effects are implemented.
   gfx::Vector2dF source_offset;
   gfx::Vector2dF source_to_parent;
 
@@ skipping 30 matching lines @@
 
   bool operator==(const TransformCachedNodeData& other) const;
 
   void ToProtobuf(proto::TransformCachedNodeData* proto) const;
   void FromProtobuf(const proto::TransformCachedNodeData& proto);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_TRANSFORM_NODE_H_