Add flag for tracking descendant paint property updates

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 1465 matching lines @@
 
   m_backgroundAttachmentFixedObjects.add(object);
   if (ScrollingCoordinator* scrollingCoordinator = this->scrollingCoordinator())
     scrollingCoordinator->frameViewHasBackgroundAttachmentFixedObjectsDidChange(
         this);
 
   // Ensure main thread scrolling reasons are recomputed.
   if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     setNeedsPaintPropertyUpdate();
     // The object's scroll properties are not affected by its own background.
-    object->setAllAncestorsNeedPaintPropertyUpdate();
+    object->setAncestorsNeedPaintPropertyUpdateForMainThreadScrolling();
   }
 }
 
 void FrameView::removeBackgroundAttachmentFixedObject(LayoutObject* object) {
   ASSERT(m_backgroundAttachmentFixedObjects.contains(object));
 
   m_backgroundAttachmentFixedObjects.remove(object);
   if (ScrollingCoordinator* scrollingCoordinator = this->scrollingCoordinator())
     scrollingCoordinator->frameViewHasBackgroundAttachmentFixedObjectsDidChange(
         this);
 
   // Ensure main thread scrolling reasons are recomputed.
   if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     setNeedsPaintPropertyUpdate();
     // The object's scroll properties are not affected by its own background.
-    object->setAllAncestorsNeedPaintPropertyUpdate();
+    object->setAncestorsNeedPaintPropertyUpdateForMainThreadScrolling();
   }
 }
 
 void FrameView::addViewportConstrainedObject(LayoutObject* object) {
   if (!m_viewportConstrainedObjects)
     m_viewportConstrainedObjects = wrapUnique(new ViewportConstrainedObjectSet);
 
   if (!m_viewportConstrainedObjects->contains(object)) {
     m_viewportConstrainedObjects->add(object);
 
@@ skipping 3131 matching lines @@
   DCHECK(m_frame->isMainFrame());
   return m_initialViewportSize.width();
 }
 
 int FrameView::initialViewportHeight() const {
   DCHECK(m_frame->isMainFrame());
   return m_initialViewportSize.height();
 }
 
 }  // namespace blink