WIP: backface visibility plumbing (not for review)

third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/graphics/compositing/PaintArtifactCompositor.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_settings.h"
 #include "cc/layers/picture_layer.h"
@@ skipping 256 matching lines @@
             // this transform.
             FloatPoint offsetDueToClipOffset = clip->clipRect().rect().location();
             offset -= gfx::Vector2dF(offsetDueToClipOffset.x(), offsetDueToClipOffset.y());
         }
         transform.Translate(offset.x(), offset.y());
 
         scoped_refptr<cc::PictureLayer> layer = cc::PictureLayer::Create(cc::LayerSettings(), contentLayerClient.get());
         layer->SetBounds(combinedBounds.size());
         layer->SetTransform(transform);
         layer->SetIsDrawable(true);
+        layer->SetDoubleSided(!paintChunk.properties.backfaceHidden);
         if (paintChunk.knownToBeOpaque)
             layer->SetContentsOpaque(true);
         layer->SetNeedsDisplay();
 
         m_contentLayerClients.append(contentLayerClient.release());
         parent->AddChild(std::move(layer));
     }
 }
 
 } // namespace blink