The "children transform layer" needs an anchor point

Source/core/rendering/compositing/CompositedLayerMapping.cpp

Index: Source/core/rendering/compositing/CompositedLayerMapping.cpp
diff --git a/Source/core/rendering/compositing/CompositedLayerMapping.cpp b/Source/core/rendering/compositing/CompositedLayerMapping.cpp
index bc5fba00020081eb8198303b64ee3ef49a622662..c165884b3da63f9ee871246c2d0aed8db9511cad 100644
--- a/Source/core/rendering/compositing/CompositedLayerMapping.cpp
+++ b/Source/core/rendering/compositing/CompositedLayerMapping.cpp
@@ -753,6 +753,9 @@ GraphicsLayerUpdater::UpdateType CompositedLayerMapping::updateGraphicsLayerGeom
         m_graphicsLayer->setAnchorPoint(FloatPoint3D(0.5f, 0.5f, 0));
     }
 
+    if (GraphicsLayer* childrenTransformLayer = layerForChildrenTransform())
+        childrenTransformLayer->setAnchorPoint(m_graphicsLayer->anchorPoint());
+
     if (m_foregroundLayer) {
         FloatSize foregroundSize = contentsSize;
         IntSize foregroundOffset = m_graphicsLayer->offsetFromRenderer();