TextIteratorAlgorithm should not force layout update in constructor.

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

Index: third_party/WebKit/Source/core/editing/PlainTextRange.cpp
diff --git a/third_party/WebKit/Source/core/editing/PlainTextRange.cpp b/third_party/WebKit/Source/core/editing/PlainTextRange.cpp
index 163d3e7ac405d0b31775305476d0715d288c4835..048ffb83a6aee7b4c40a5328ae4c0f1cc6977ffc 100644
--- a/third_party/WebKit/Source/core/editing/PlainTextRange.cpp
+++ b/third_party/WebKit/Source/core/editing/PlainTextRange.cpp
@@ -82,6 +82,11 @@ EphemeralRange PlainTextRange::createRangeFor(const ContainerNode& scope, GetRan
     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