Only automatically promote sticky position elements which move with scroll.

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 9a608ea2d0aa84af160a63d7440a00ca320aed39..120181338512305eb563d722589a583e2c7f7dfa 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -5010,7 +5010,7 @@ bool FrameView::hasVisibleSlowRepaintViewportConstrainedObjects() const {
     // Whether the Layer sticks to the viewport is a tree-depenent
     // property and our viewportConstrainedObjects collection is maintained
     // with only LayoutObject-level information.
-    if (!layer->sticksToViewport())
+    if (!layer->fixedToViewport() && !layer->sticksToScroller())
       continue;
 
     // If the whole subtree is invisible, there's no reason to scroll on