Absolute-position the initial containing block.

Source/core/layout/TextAutosizer.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 209 matching lines @@
     // FIXME: Propagate constrainedness down the tree, to avoid inefficiently walking back up from each box.
     // FIXME: This code needs to take into account vertical writing modes.
     // FIXME: Consider additional heuristics, such as ignoring fixed heights if the content is already overflowing before autosizing kicks in.
     for (; block; block = block->containingBlock()) {
         const ComputedStyle& style = block->styleRef();
         if (style.overflowY() >= OSCROLL)
             return false;
         if (style.height().isSpecified() || style.maxHeight().isSpecified() || block->isOutOfFlowPositioned()) {
             // Some sites (e.g. wikipedia) set their html and/or body elements to height:100%,
             // without intending to constrain the height of the content within them.
-            return !block->isDocumentElement() && !block->isBody();
+            return !block->isDocumentElement() && !block->isBody() && !block->isLayoutView();
         }
         if (block->isFloating())
             return false;
     }
     return false;
 }
 
 static bool blockOrImmediateChildrenAreFormControls(const LayoutBlock* block)
 {
     if (isNonTextAreaFormControl(block))
@@ skipping 927 matching lines @@
     }
     return computedSize;
 }
 
 DEFINE_TRACE(TextAutosizer)
 {
     visitor->trace(m_document);
 }
 
 } // namespace blink