Only create sticky position constraints for constrained sticky position.

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@gmail.com>
@@ skipping 1566 matching lines @@
     d->sticky_constraints_map_.Clear();
   }
 }
 
 void PaintLayerScrollableArea::InvalidateStickyConstraintsFor(
     PaintLayer* layer,
     bool needs_compositing_update) {
   if (PaintLayerScrollableAreaRareData* d = RareData()) {
     d->sticky_constraints_map_.erase(layer);
     if (needs_compositing_update &&
-        layer->GetLayoutObject().Style()->GetPosition() == EPosition::kSticky)
+        layer->GetLayoutObject().Style()->HasStickyConstrainedPosition())
       layer->SetNeedsCompositingInputsUpdate();
   }
 }
 
 IntSize PaintLayerScrollableArea::OffsetFromResizeCorner(
     const IntPoint& absolute_point) const {
   // Currently the resize corner is either the bottom right corner or the bottom
   // left corner.
   // FIXME: This assumes the location is 0, 0. Is this guaranteed to always be
   // the case?
@@ skipping 578 matching lines @@
 
 void PaintLayerScrollableArea::DelayScrollOffsetClampScope::
     ClampScrollableAreas() {
   for (auto& scrollable_area : *needs_clamp_)
     scrollable_area->ClampScrollOffsetAfterOverflowChange();
   delete needs_clamp_;
   needs_clamp_ = nullptr;
 }
 
 }  // namespace blink