Fully update compositing information for *layerTreeAsText calls

Source/core/frame/LocalFrame.cpp

Index: Source/core/frame/LocalFrame.cpp
diff --git a/Source/core/frame/LocalFrame.cpp b/Source/core/frame/LocalFrame.cpp
index 2add1aad732196d33bc1e784553a03c8878c3438..1a13ed7e7221e3099987f5358fd2ea2dcda11ad3 100644
--- a/Source/core/frame/LocalFrame.cpp
+++ b/Source/core/frame/LocalFrame.cpp
@@ -425,11 +425,11 @@ void LocalFrame::countObjectsNeedingLayout(unsigned& needsLayoutObjects, unsigne
 
 String LocalFrame::layerTreeAsText(unsigned flags) const
 {
-    document()->updateLayout();
-
     if (!contentRenderer())
         return String();
 
+    ASSERT(document()->lifecycle().state() >= DocumentLifecycle::CompositingClean);
+
     return contentRenderer()->compositor()->layerTreeAsText(static_cast<LayerTreeFlags>(flags));
 }