Fix check failure when an offscreen element has animated background and first-line style

third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 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 2049 matching lines @@
     if (RootInlineBox* firstRootBox = this->firstRootBox())
         firstRootBox->setShouldDoFullPaintInvalidationRecursively();
 }
 
 PaintInvalidationReason LayoutBlockFlow::invalidatePaintIfNeeded(const PaintInvalidationState& paintInvalidationState)
 {
     if (containsFloats())
         paintInvalidationState.paintingLayer().setNeedsPaintPhaseFloat();
 
     PaintInvalidationReason reason = LayoutBlock::invalidatePaintIfNeeded(paintInvalidationState);
-    if (reason == PaintInvalidationNone)
+    if (reason == PaintInvalidationNone || reason == PaintInvalidationDelayedFull)
         return reason;
+
     RootInlineBox* line = firstRootBox();
     if (!line || !line->isFirstLineStyle())
         return reason;
     // It's the RootInlineBox that paints the ::first-line background. Note that since it may be
     // expensive to figure out if the first line is affected by any ::first-line selectors at all,
     // we just invalidate it unconditionally, since that's typically cheaper.
     invalidateDisplayItemClient(*line, reason);
     return reason;
 }
 
 } // namespace blink