Fully update compositing information for *layerTreeAsText calls

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 1628 matching lines @@
     return document->isPageBoxVisible(pageNumber);
 }
 
 String Internals::layerTreeAsText(Document* document, ExceptionState& exceptionState) const
 {
     return layerTreeAsText(document, 0, exceptionState);
 }
 
 String Internals::elementLayerTreeAsText(Element* element, ExceptionState& exceptionState) const
 {
-    DisableCompositingQueryAsserts disabler;
+    FrameView* frameView = element->document().view();
+    frameView->updateLayoutAndStyleForPainting();
+
     return elementLayerTreeAsText(element, 0, exceptionState);
 }
 
 static PassRefPtr<NodeList> paintOrderList(Element* element, ExceptionState& exceptionState, RenderLayerStackingNode::PaintOrderListType type)
 {
     if (!element) {
         exceptionState.throwDOMException(InvalidAccessError, ExceptionMessages::argumentNullOrIncorrectType(1, "Element"));
         return nullptr;
     }
 
@@ skipping 104 matching lines @@
     return layer->needsCompositedScrolling();
 }
 
 String Internals::layerTreeAsText(Document* document, unsigned flags, ExceptionState& exceptionState) const
 {
     if (!document || !document->frame()) {
         exceptionState.throwDOMException(InvalidAccessError, document ? "The document's frame cannot be retrieved." : "The document provided is invalid.");
         return String();
     }
 
+    document->view()->updateLayoutAndStyleForPainting();
+
     return document->frame()->layerTreeAsText(flags);
 }
 
 String Internals::elementLayerTreeAsText(Element* element, unsigned flags, ExceptionState& exceptionState) const
 {
     if (!element) {
         exceptionState.throwDOMException(InvalidAccessError, ExceptionMessages::argumentNullOrIncorrectType(1, "Element"));
         return String();
     }
 
@@ skipping 626 matching lines @@
 }
 
 String Internals::textSurroundingNode(Node* node, int x, int y, unsigned long maxLength)
 {
     blink::WebPoint point(x, y);
     SurroundingText surroundingText(VisiblePosition(node->renderer()->positionForPoint(static_cast<IntPoint>(point))), maxLength);
     return surroundingText.content();
 }
 
 }