Fully update compositing information for *layerTreeAsText calls

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 65bd2e614f46fe1463efcd8805cd0b9aae2a3ed1..d75f2f1835972f65e6e215e39f899809d059f204 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -1646,7 +1646,9 @@ String Internals::layerTreeAsText(Document* document, ExceptionState& exceptionS
 
 String Internals::elementLayerTreeAsText(Element* element, ExceptionState& exceptionState) const
 {
-    DisableCompositingQueryAsserts disabler;
+    FrameView* frameView = element->document().view();
+    frameView->updateLayoutAndStyleForPainting();
+
     return elementLayerTreeAsText(element, 0, exceptionState);
 }
 
@@ -1771,6 +1773,8 @@ String Internals::layerTreeAsText(Document* document, unsigned flags, ExceptionS
         return String();
     }
 
+    document->view()->updateLayoutAndStyleForPainting();
+
     return document->frame()->layerTreeAsText(flags);
 }