Call didProgrammaticallyScroll only when ProgrammaticScrollNotifications is enabled, which is an ex…

Source/core/page/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 1562 matching lines @@
 void FrameView::setScrollPosition(const IntPoint& scrollPoint)
 {
     TemporaryChange<bool> changeInProgrammaticScroll(m_inProgrammaticScroll, true);
     m_maintainScrollPositionAnchor = 0;
 
     IntPoint newScrollPosition = adjustScrollPositionWithinRange(scrollPoint);
 
     if (newScrollPosition == scrollPosition())
         return;
 
-    if (Page* page = m_frame->page())
+    Page* page = m_frame->page();
+    if (page && RuntimeEnabledFeatures::programmaticScrollNotificationsEnabled())
         page->chrome().client()->didProgrammaticallyScroll(m_frame.get(), newScrollPosition);
 
     if (requestScrollPositionUpdate(newScrollPosition))
         return;
 
     ScrollView::setScrollPosition(newScrollPosition);
 }
 
 void FrameView::setScrollPositionNonProgrammatically(const IntPoint& scrollPoint)
 {
@@ skipping 1822 matching lines @@
 }
 
 AXObjectCache* FrameView::axObjectCache() const
 {
     if (frame() && frame()->document())
         return frame()->document()->existingAXObjectCache();
     return 0;
 }
 
 } // namespace WebCore