[Layout API] Add LocalFrame::contentLayoutItem and use in VisualViewport

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 2877 matching lines @@
 }
 
 void FrameView::setTracksPaintInvalidations(bool trackPaintInvalidations)
 {
     if (trackPaintInvalidations == m_isTrackingPaintInvalidations)
         return;
 
     for (Frame* frame = m_frame->tree().top(); frame; frame = frame->tree().traverseNext()) {
         if (!frame->isLocalFrame())
             continue;
-        if (LayoutViewItem layoutView = LayoutViewItem(toLocalFrame(frame)->contentLayoutObject()))
+        if (LayoutViewItem layoutView = toLocalFrame(frame)->contentLayoutItem())
             layoutView.compositor()->setTracksPaintInvalidations(trackPaintInvalidations);
     }
 
     TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("blink.invalidation"),
         "FrameView::setTracksPaintInvalidations", TRACE_EVENT_SCOPE_GLOBAL, "enabled", trackPaintInvalidations);
 
     resetTrackedPaintInvalidations();
     m_isTrackingPaintInvalidations = trackPaintInvalidations;
 }
 
@@ skipping 1183 matching lines @@
     return m_hiddenForThrottling && m_crossOriginForThrottling;
 }
 
 LayoutBox& FrameView::boxForScrollControlPaintInvalidation() const
 {
     ASSERT(layoutView());
     return *layoutView();
 }
 
 } // namespace blink