Expand FrameSeleciton::start() to increase chances of hoisting update layout

third_party/WebKit/Source/core/clipboard/DataTransfer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 304 matching lines @@
 
   // The URL can also be used as an HTML fragment.
   m_dataObject->setHTMLAndBaseURL(
       createMarkup(node, IncludeNode, ResolveAllURLs), url);
 }
 
 void DataTransfer::writeSelection(const FrameSelection& selection) {
   if (!m_dataObject)
     return;
 
-  if (!enclosingTextControl(selection.start())) {
+  if (!enclosingTextControl(
+          selection.computeVisibleSelectionInDOMTreeDeprecated().start())) {
     m_dataObject->setHTMLAndBaseURL(selection.selectedHTMLForClipboard(),
                                     selection.frame()->document()->url());
   }
 
   String str = selection.selectedTextForClipboard();
 #if OS(WIN)
   replaceNewlinesWithWindowsStyleNewlines(str);
 #endif
   replaceNBSPWithSpace(str);
   m_dataObject->setData(mimeTypeTextPlain, str);
@@ skipping 140 matching lines @@
   }
 }
 
 DEFINE_TRACE(DataTransfer) {
   visitor->trace(m_dataObject);
   visitor->trace(m_dragImage);
   visitor->trace(m_dragImageElement);
 }
 
 }  // namespace blink