Mark layer needsPaintPhaseFloat if a LayoutBlockFlow contains float

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 2081 matching lines @@
 
 void LayoutBlockFlow::invalidateDisplayItemClientsOfFirstLine()
 {
     ASSERT(childrenInline());
     if (RootInlineBox* firstRootBox = this->firstRootBox())
         firstRootBox->invalidateDisplayItemClientsRecursively();
 }
 
 PaintInvalidationReason LayoutBlockFlow::invalidatePaintIfNeeded(const PaintInvalidationState& paintInvalidationState)
 {
+    if (containsFloats())
+        paintInvalidationState.enclosingSelfPaintingLayer(*this).setNeedsPaintPhaseFloat();
+
     PaintInvalidationReason reason = LayoutBlock::invalidatePaintIfNeeded(paintInvalidationState);
     if (reason == PaintInvalidationNone)
         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);
     return reason;
 }
 
 } // namespace blink