Fix Repaint-After-Layout after partial layout removal.

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 986 matching lines @@
     InspectorInstrumentation::didLayout(cookie, rootForThisLayout);
 
     m_nestedLayoutCount--;
     if (m_nestedLayoutCount)
         return;
 
     if (RuntimeEnabledFeatures::repaintAfterLayoutEnabled()) {
         if (m_doFullRepaint)
             renderView()->setShouldDoFullRepaintAfterLayout(true);
 
-        if (m_doFullRepaint)
-            repaintTree(rootForThisLayout);
+        repaintTree(rootForThisLayout);

[Julien - ping for review, 2014/03/20 15:06:46]

We talked about this with Dan: this will cause us to generate invalidation for
FrameView's full repaint which are unneeded. However we currently have to run
repaintTree at the end of layout or else we won't clear some state.

 
     } else if (m_doFullRepaint) {
         // FIXME: This isn't really right, since the RenderView doesn't fully encompass
         // the visibleContentRect(). It just happens to work out most of the time,
         // since first layouts and printing don't have you scrolled anywhere.
         renderView()->repaint();
     }
 
     m_doFullRepaint = false;
 
@@ skipping 2197 matching lines @@
 void FrameView::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
 {
     ScrollableArea::willRemoveScrollbar(scrollbar, orientation);
     if (AXObjectCache* cache = axObjectCache()) {
         cache->remove(scrollbar);
         cache->handleScrollbarUpdate(this);
     }
 }
 
 } // namespace WebCore