Early-out from the prepaint tree walk

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 1282 matching lines @@
   if (m_frame->selection().isCaretBoundsDirty())
     m_frame->selection().invalidateCaretRect();
 
   // Temporary callback for crbug.com/487345,402044
   // TODO(ojan): Make this more general to be used by PositionObserver
   // and rAF throttling.
   IntRect visibleRect = rootFrameToContents(computeVisibleArea());
   layoutViewItem().sendMediaPositionChangeNotifications(visibleRect);
 }
 
+void FrameView::setNeedsPaintPropertyUpdate() {
+  m_needsPaintPropertyUpdate = true;
+  if (LayoutObject* owner = frame().ownerLayoutObject())
+    owner->setDescendantNeedsPaintPropertyUpdate();
+}
+
 IntRect FrameView::computeVisibleArea() {
   // Return our clipping bounds in the root frame.
   IntRect us(frameRect());
   if (FrameView* parent = parentFrameView()) {
     us = parent->contentsToRootFrame(us);
     IntRect parentRect = parent->computeVisibleArea();
     if (parentRect.isEmpty())
       return IntRect();
 
     us.intersect(parentRect);
@@ skipping 3338 matching lines @@
   DCHECK(m_frame->isMainFrame());
   return m_initialViewportSize.width();
 }
 
 int FrameView::initialViewportHeight() const {
   DCHECK(m_frame->isMainFrame());
   return m_initialViewportSize.height();
 }
 
 }  // namespace blink