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

third_party/WebKit/Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * 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 554 matching lines @@
       SelectionInDOMTree::Builder().collapse(caretPosition).build());
   m_page->dragCaret().clear();
   // |innerFrame| can be removed by event handler called by
   // |dispatchTextInputEventFor()|.
   if (!innerFrame->selection().isAvailable()) {
     // "editing/pasteboard/drop-text-events-sideeffect-crash.html" reaches
     // here.
     return false;
   }
   Range* range = createRange(dragCaret.toNormalizedEphemeralRange());
-  Element* rootEditableElement = innerFrame->selection().rootEditableElement();
+  Element* rootEditableElement =
+      innerFrame->selection()
+          .computeVisibleSelectionInDOMTreeDeprecated()
+          .rootEditableElement();
 
   // For range to be null a WebKit client must have done something bad while
   // manually controlling drag behaviour
   if (!range)
     return false;
   ResourceFetcher* fetcher = range->ownerDocument().fetcher();
   ResourceCacheValidationSuppressor validationSuppressor(fetcher);
 
   // Start new Drag&Drop command group, invalidate previous command group.
   // Assume no other places is firing |DeleteByDrag| and |InsertFromDrop|.
@@ skipping 651 matching lines @@
 
 DEFINE_TRACE(DragController) {
   visitor->trace(m_page);
   visitor->trace(m_documentUnderMouse);
   visitor->trace(m_dragInitiator);
   visitor->trace(m_dragState);
   visitor->trace(m_fileInputElementUnderMouse);
 }
 
 }  // namespace blink