Fix sticky constraints and update sticky layer positions recursively after scroll.

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 1604 matching lines @@
 
     setLayoutSizeInternal(size);
 }
 
 void FrameView::didScrollTimerFired(Timer<FrameView>*)
 {
     if (m_frame->document() && !m_frame->document()->layoutViewItem().isNull())
         m_frame->document()->fetcher()->updateAllImageResourcePriorities();
 }
 
-void FrameView::updateLayersAndCompositingAfterScrollIfNeeded()
+void FrameView::updateLayersAndCompositingAfterScrollIfNeeded(const DoubleSize& scrollDelta)
 {
     // Nothing to do after scrolling if there are no fixed position elements.
     if (!hasViewportConstrainedObjects())
         return;
 
     // Update sticky position objects which are stuck to the viewport.
     for (const auto& viewportConstrainedObject : *m_viewportConstrainedObjects) {
         LayoutObject* layoutObject = viewportConstrainedObject;
         PaintLayer* layer = toLayoutBoxModelObject(layoutObject)->layer();
-        if (layoutObject->style()->position() == StickyPosition)
-            layer->updateLayerPosition();
+        if (layoutObject->style()->position() == StickyPosition) {
+            // TODO(skobes): Resolve circular dependency between scroll offset and
+            // compositing state, and remove this disabler. https://crbug.com/420741
+            DisableCompositingQueryAsserts disabler;
+            layer->updateLayerPositionsAfterOverflowScroll(scrollDelta);
+        }
     }
 
     // If there fixed position elements, scrolling may cause compositing layers to change.
     // Update widget and layer positions after scrolling, but only if we're not inside of
     // layout.
     if (!m_nestedLayoutCount) {
         updateWidgetGeometries();
         LayoutViewItem layoutViewItem = this->layoutViewItem();
         if (!layoutViewItem.isNull())
             layoutViewItem.layer()->setNeedsCompositingInputsUpdate();
@@ skipping 1603 matching lines @@
         // Don't scroll the FrameView!
         ASSERT_NOT_REACHED();
     }
 
     m_scrollPosition = newPosition;
 
     if (!scrollbarsSuppressed())
         m_pendingScrollDelta += scrollDelta;
 
     clearFragmentAnchor();
-    updateLayersAndCompositingAfterScrollIfNeeded();
+    updateLayersAndCompositingAfterScrollIfNeeded(scrollDelta);
 
     Document* document = m_frame->document();
     document->enqueueScrollEventForNode(document);
 
     m_frame->eventHandler().dispatchFakeMouseMoveEventSoon();
     Page* page = frame().page();
     if (page)
         page->chromeClient().clearToolTip();
 
     LayoutViewItem layoutViewItem = document->layoutViewItem();
@@ skipping 877 matching lines @@
     return m_subtreeThrottled || (m_hiddenForThrottling && m_crossOriginForThrottling);
 }
 
 LayoutBox& FrameView::boxForScrollControlPaintInvalidation() const
 {
     ASSERT(!layoutViewItem().isNull());
     return *layoutView();
 }
 
 } // namespace blink