Input element is not scrolled into center during composition

Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 84 matching lines @@
     : m_editor(editor)
 {
     ++m_editor->m_preventRevealSelection;
 }
 
 Editor::RevealSelectionScope::~RevealSelectionScope()
 {
     ASSERT(m_editor->m_preventRevealSelection);
     --m_editor->m_preventRevealSelection;
     if (!m_editor->m_preventRevealSelection)
-        m_editor->frame().selection().revealSelection(ScrollAlignment::alignToEdgeIfNeeded, RevealExtent);
+        m_editor->frame().selection().revealSelection(ScrollAlignment::alignCenterIfNeeded, RevealExtent);
 }
 
 // When an event handler has moved the selection outside of a text control
 // we should use the target control's selection for this editing operation.
 VisibleSelection Editor::selectionForCommand(Event* event)
 {
     VisibleSelection selection = frame().selection().selection();
     if (!event)
         return selection;
     // If the target is a text control, and the current selection is outside of its shadow tree,
@@ skipping 1151 matching lines @@
 }
 
 DEFINE_TRACE(Editor)
 {
     visitor->trace(m_frame);
     visitor->trace(m_lastEditCommand);
     visitor->trace(m_mark);
 }
 
 } // namespace blink