Don't allow subsequence caching for fragmented PaintLayers.

third_party/WebKit/Source/core/paint/PaintLayer.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>
@@ skipping 2751 matching lines @@
             GetCompositingState() != kPaintsIntoOwnBacking);
   }
 
   return (Transform() ||
           GetLayoutObject().Style()->GetPosition() == EPosition::kFixed) &&
          ((global_paint_flags & kGlobalPaintFlattenCompositingLayers) ||
           GetCompositingState() != kPaintsIntoOwnBacking);
 }
 
 bool PaintLayer::SupportsSubsequenceCaching() const {
+  if (EnclosingPaginationLayer())
+    return false;
+
   // SVG paints atomically.
   if (GetLayoutObject().IsSVGRoot())
     return true;
 
   // Create subsequence for only stacking contexts whose painting are atomic.
   if (!StackingNode()->IsStackingContext())
     return false;
 
   // The layer doesn't have children. Subsequence caching is not worth it,
   // because normally the actual painting will be cheap.
@@ skipping 542 matching lines @@
 }
 
 void showLayerTree(const blink::LayoutObject* layoutObject) {
   if (!layoutObject) {
     LOG(INFO) << "Cannot showLayerTree. Root is (nil)";
     return;
   }
   showLayerTree(layoutObject->EnclosingLayer());
 }
 #endif