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 35e8ee2f5ac32dd40bc3d67d125827f1c6de25e6..f44a2837aee722ae1e1bec830d4ada1fde1a2118 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -1647,7 +1647,9 @@ 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);
 }
 
@@ -1772,6 +1774,8 @@ String Internals::layerTreeAsText(Document* document, unsigned flags, ExceptionS
         return String();
     }
 
+    document->view()->updateLayoutAndStyleForPainting();
+
     return document->frame()->layerTreeAsText(flags);
 }