Don't cache subsequence whose layer is not fully contained by repaint rect

Source/core/paint/DeprecatedPaintLayerReflectionInfo.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 111 matching lines @@
         break;
     }
     newStyle->setTransform(transform);
 
     // Map in our mask.
     newStyle->setMaskBoxImage(box().style()->boxReflect()->mask());
 
     m_reflection->setStyle(newStyle.release());
 }
 
-void DeprecatedPaintLayerReflectionInfo::paint(GraphicsContext* context, const DeprecatedPaintLayerPaintingInfo& paintingInfo, PaintLayerFlags flags)
+DeprecatedPaintLayerPainter::PaintResult DeprecatedPaintLayerReflectionInfo::paint(GraphicsContext* context, const DeprecatedPaintLayerPaintingInfo& paintingInfo, PaintLayerFlags flags)
 {
     if (m_isPaintingInsideReflection)
-        return;
+        return DeprecatedPaintLayerPainter::FullyPainted;
 
     // Mark that we are now inside replica painting.
     m_isPaintingInsideReflection = true;
-    DeprecatedPaintLayerPainter(*reflectionLayer()).paintLayer(context, paintingInfo, flags);
+    DeprecatedPaintLayerPainter::PaintResult result = DeprecatedPaintLayerPainter(*reflectionLayer()).paintLayer(context, paintingInfo, flags);
     m_isPaintingInsideReflection = false;
+    return result;
 }
 
 } // namespace blink