Avoid RenderObject::paintInvalidationForWholeRenderer() if possible

Source/core/rendering/RenderWidget.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 252 matching lines @@
         return;
 
     if (!needsLayout())
         updateWidgetGeometry();
 
     if (style()->visibility() != VISIBLE) {
         widget->hide();
     } else {
         widget->show();
         // FIXME: Why do we issue a full paint invalidation in this case, but not the other?
-        paintInvalidationForWholeRenderer();
+        setShouldDoFullPaintInvalidation(true);
     }
 }
 
 void RenderWidget::updateWidgetPosition()
 {
     Widget* widget = this->widget();
     if (!widget || !node()) // Check the node in case destroy() has been called.
         return;
 
     bool boundsChanged = updateWidgetGeometry();
@@ skipping 30 matching lines @@
 CursorDirective RenderWidget::getCursor(const LayoutPoint& point, Cursor& cursor) const
 {
     if (widget() && widget()->isPluginView()) {
         // A plug-in is responsible for setting the cursor when the pointer is over it.
         return DoNotSetCursor;
     }
     return RenderReplaced::getCursor(point, cursor);
 }
 
 } // namespace blink