Suppress layer creation for descendants of GPU-rasterized layers

Source/core/rendering/compositing/RenderLayerCompositor.cpp

Index: Source/core/rendering/compositing/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/compositing/RenderLayerCompositor.cpp b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
index a8a42305b9ea99df19e8c87be5b54d9bc4a53dbd..89cbeb92a3a49524cc54caa680865e38e70eae9b 100644
--- a/Source/core/rendering/compositing/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
@@ -1188,12 +1188,14 @@ void RenderLayerCompositor::updateRootLayerPosition()
 void RenderLayerCompositor::updateStyleDeterminedCompositingReasons(RenderLayer* layer)
 {
     CompositingReasons reasons = m_compositingReasonFinder.styleDeterminedReasons(layer->renderer());
-    layer->setCompositingReasons(reasons, CompositingReasonComboAllStyleDeterminedReasons);
+    layer->setStyleDeterminedCompositingReasons(reasons);
 }
 
 void RenderLayerCompositor::updateDirectCompositingReasons(RenderLayer* layer)
 {
     CompositingReasons reasons = m_compositingReasonFinder.directReasons(layer, &m_needsToRecomputeCompositingRequirements);
+    if (layer->suppressingCompositedLayerCreation())
+        reasons = m_compositingReasonFinder.suppressWillChangeAndAnimationForGpuRasterization(layer, reasons);
     layer->setCompositingReasons(reasons, CompositingReasonComboAllDirectReasons);
 }