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

third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

 /*
  * Copyright (C) 2014 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 584 matching lines @@
 
   // TODO(xiaochengh): The use of updateStyleAndLayoutIgnorePendingStylesheets
   // needs to be audited.  See http://crbug.com/590369 for more details.
   frame->document()->updateStyleAndLayoutIgnorePendingStylesheets();
 
   FrameSelection& selection = frame->selection();
   if (selection.computeVisibleSelectionInDOMTree()
           .toNormalizedEphemeralRange()
           .isNull())
     return false;
-  start =
-      toWebTextDirection(primaryDirectionOf(*selection.start().anchorNode()));
+  start = toWebTextDirection(
+      primaryDirectionOf(*selection.computeVisibleSelectionInDOMTreeDeprecated()
+                              .start()
+                              .anchorNode()));
   end = toWebTextDirection(
       primaryDirectionOf(*selection.computeVisibleSelectionInDOMTreeDeprecated()
                               .end()
                               .anchorNode()));
   return true;
 }
 
 // TODO(ekaramad):This method is almost duplicated in WebViewImpl as well. This
 // code needs to be refactored  (http://crbug.com/629721).
 bool WebFrameWidgetImpl::isSelectionAnchorFirst() const {
@@ skipping 523 matching lines @@
   return nullptr;
 }
 
 LocalFrame* WebFrameWidgetImpl::focusedLocalFrameAvailableForIme() const {
   if (!m_imeAcceptEvents)
     return nullptr;
   return focusedLocalFrameInWidget();
 }
 
 }  // namespace blink