Allow compositing of hidden layers

Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp

Index: Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
diff --git a/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp b/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
index df498e8702a22dfb8dd8b3040fb38080fa5c32ff..82489596a73cf2d8af8aa4af7e6371e460bb4990 100644
--- a/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
+++ b/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
@@ -778,7 +778,8 @@ void DeprecatedPaintLayerCompositor::updateDirectCompositingReasons(DeprecatedPa
 
 bool DeprecatedPaintLayerCompositor::canBeComposited(const DeprecatedPaintLayer* layer) const
 {
-    return m_hasAcceleratedCompositing && layer->isSelfPaintingLayer() && !layer->subtreeIsInvisible() && !layer->layoutObject()->isLayoutFlowThread();
+    const bool hasCompositorAnimation = m_compositingReasonFinder.requiresCompositingForAnimation(*layer->layoutObject()->style());
+    return m_hasAcceleratedCompositing && (hasCompositorAnimation || !layer->subtreeIsInvisible()) && layer->isSelfPaintingLayer() && !layer->layoutObject()->isLayoutFlowThread();
 }
 
 // Return true if the given layer is a stacking context and has compositing child