Fix backface-visibility with will-change

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1315 matching lines @@
   } else {
     host_layer_position.Move(-graphics_layer_->OffsetFromLayoutObject());
   }
 
   overflow_controls_host_layer_->SetPosition(FloatPoint(host_layer_position));
 
   const IntRect border_box =
       ToLayoutBox(owning_layer_.GetLayoutObject()).PixelSnappedBorderBoxRect();
   overflow_controls_host_layer_->SetSize(FloatSize(border_box.Size()));
   overflow_controls_host_layer_->SetMasksToBounds(true);
+  overflow_controls_host_layer_->SetBackfaceVisibility(
+      owning_layer_.GetLayoutObject().Style()->BackfaceVisibility() ==
+      kBackfaceVisibilityVisible);
 }
 
 void CompositedLayerMapping::UpdateChildContainmentLayerGeometry(
     const IntRect& clipping_box,
     const IntRect& local_compositing_bounds) {
   if (!child_containment_layer_)
     return;
 
   FloatPoint clip_position_in_layout_object_space(
       clipping_box.Location() - local_compositing_bounds.Location() +
@@ skipping 2255 matching lines @@
   } else if (graphics_layer == decoration_outline_layer_.get()) {
     name = "Decoration Layer";
   } else {
     NOTREACHED();
   }
 
   return name;
 }
 
 }  // namespace blink