Reset m_didTransformToRootUpdate flag during invalidationTreeIfNeeded

Source/core/rendering/svg/RenderSVGViewportContainer.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  *
  * 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 95 matching lines @@
 void RenderSVGViewportContainer::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     ASSERT(element());
     // An empty viewBox disables rendering.
     if (isSVGSVGElement(*element()) && toSVGSVGElement(*element()).hasEmptyViewBox())
         return;
 
     RenderSVGContainer::paint(paintInfo, paintOffset);
 }
 
+void RenderSVGViewportContainer::clearPaintInvalidationState()
+{
+    ASSERT(!m_needsTransformUpdate);
+    m_didTransformToRootUpdate = false;
 }
+
+}