Fix ASSERT(needsLayout()) failing when autosize mode is enabled

Source/core/page/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 2433 matching lines @@
 
     Document* document = frame()->document();
     if (!document)
         return;
 
     RenderView* documentView = document->renderView();
     Element* documentElement = document->documentElement();
     if (!documentView || !documentElement)
         return;
 
-    // Start from the minimum height and allow it to grow.
-    resize(frameRect().width(), m_minAutoSize.height());
+    RenderBox* documentRenderBox = documentElement->renderBox();
+    if (!documentRenderBox)
+        return;
+
+    // If this is the first time we run autosize, start from small height and
+    // allow it to grow.
+    if (!m_didRunAutosize)
+        resize(frameRect().width(), m_minAutoSize.height());
 
     IntSize size = frameRect().size();
 
     // Do the resizing twice. The first time is basically a rough calculation using the preferred width
     // which may result in a height change during the second iteration.
     for (int i = 0; i < 2; i++) {
         // Update various sizes including contentsSize, scrollHeight, etc.
         document->updateLayoutIgnorePendingStylesheets();
         int width = documentView->minPreferredLogicalWidth();
-        int height = documentView->documentRect().height();
+        int height = documentRenderBox->scrollHeight();
         IntSize newSize(width, height);
 
         // Check to see if a scrollbar is needed for a given dimension and
         // if so, increase the other dimension to account for the scrollbar.
         // Since the dimensions are only for the view rectangle, once a
         // dimension exceeds the maximum, there is no need to increase it further.
         if (newSize.width() > m_maxAutoSize.width()) {
             RefPtr<Scrollbar> localHorizontalScrollbar = horizontalScrollbar();
             if (!localHorizontalScrollbar)
                 localHorizontalScrollbar = createScrollbar(HorizontalScrollbar);
@@ skipping 1124 matching lines @@
 }
     
 AXObjectCache* FrameView::axObjectCache() const
 {
     if (frame() && frame()->document())
         return frame()->document()->existingAXObjectCache();
     return 0;
 }
     
 } // namespace WebCore