Fix the bug that sticky element may not be correctly invalidated due to non-promotion

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

Index: third_party/WebKit/Source/core/paint/PaintLayer.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayer.cpp b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
index 1f9148f70c35bc50321b277d0a6b01410f2b6fb7..4e69c5914557c34f4ac5c11f9a6d127be38b6507 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayer.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
@@ -838,6 +838,12 @@ void PaintLayer::UpdateLayerPosition() {
 
   if (GetLayoutObject().IsInFlowPositioned()) {
     LayoutSize new_offset = GetLayoutObject().OffsetForInFlowPosition();
+    if (GetLayoutObject().Style()->GetPosition() == EPosition::kSticky &&
+        !HasCompositedLayerMapping() &&
+        OffsetForInFlowPosition() != new_offset) {
+      ObjectPaintInvalidator(GetLayoutObject())
+          .InvalidatePaintIncludingNonCompositingDescendants();
+    }
     if (rare_data_ || !new_offset.IsZero())
       EnsureRareData().offset_for_in_flow_position = new_offset;
     local_point.Move(new_offset);