TextIteratorAlgorithm should not force layout update in constructor.

third_party/WebKit/Source/core/editing/PlainTextRange.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 64 matching lines @@
     size_t docTextPosition = 0;
     bool startRangeFound = false;
 
     Position textRunStartPosition;
     Position textRunEndPosition;
 
     TextIteratorBehaviorFlags behaviorFlags = TextIteratorEmitsObjectReplacementCharacter;
     if (getRangeFor == ForSelection)
         behaviorFlags |= TextIteratorEmitsCharactersBetweenAllVisiblePositions;
     auto range = EphemeralRange::rangeOfContents(scope);
+
+    // TODO(dglazkov): The use of updateLayoutIgnorePendingStylesheets needs to be audited.
+    // see http://crbug.com/590369 for more details.
+    scope.document().updateLayoutIgnorePendingStylesheets();
+
     TextIterator it(range.startPosition(), range.endPosition(), behaviorFlags);
 
     // FIXME: the atEnd() check shouldn't be necessary, workaround for
     // <http://bugs.webkit.org/show_bug.cgi?id=6289>.
     if (!start() && !length() && it.atEnd())
         return EphemeralRange(Position(it.currentContainer(), 0));
 
     Position resultStart = Position(&scope.document(), 0);
     Position resultEnd = resultStart;
 
@@ skipping 85 matching lines @@
 
     return PlainTextRange(start, end);
 }
 
 PlainTextRange PlainTextRange::create(const ContainerNode& scope, const Range& range)
 {
     return create(scope, EphemeralRange(&range));
 }
 
 } // namespace blink