Only create sticky position constraints for constrained sticky position.

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

 // Copyright 2015 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 "core/paint/PrePaintTreeWalk.h"
 
 #include "core/dom/DocumentLifecycle.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/layout/LayoutMultiColumnSpannerPlaceholder.h"
@@ skipping 80 matching lines @@
                                             PrePaintTreeWalkContext& context) {
   if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled())
     return;
 
   if (!object.hasLayer())
     return;
 
   PaintLayer* paintLayer = object.enclosingLayer();
   paintLayer->updateAncestorOverflowLayer(context.ancestorOverflowPaintLayer);
 
-  if (object.styleRef().position() == EPosition::kSticky) {
+  if (object.styleRef().hasStickyConstrainedPosition()) {
     paintLayer->layoutObject().updateStickyPositionConstraints();
 
     // Sticky position constraints and ancestor overflow scroller affect the
     // sticky layer position, so we need to update it again here.
     // TODO(flackr): This should be refactored in the future to be clearer (i.e.
     // update layer position and ancestor inputs updates in the same walk).
     paintLayer->updateLayerPosition();
   }
 
   if (paintLayer->isRootLayer() || object.hasOverflowClip())
@@ skipping 169 matching lines @@
           roundedIntPoint(context.treeBuilderContext->current.paintOffset);
       walk(*toFrameView(frameViewBase), context);
     }
     // TODO(pdr): Investigate RemoteFrameView (crbug.com/579281).
   }
 
   object.getMutableForPainting().clearPaintFlags();
 }
 
 }  // namespace blink