Introduce createRange(const EphemeralRange&)

Source/core/editing/EphemeralRange.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/editing/EphemeralRange.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/Range.h"
@@ skipping 126 matching lines @@
     return m_startPosition.isNull() || m_domTreeVersion == m_startPosition.document()->domTreeVersion();
 }
 #else
 template <typename Strategy>
 bool EphemeralRangeTemplate<Strategy>::isValid() const
 {
     return true;
 }
 #endif
 
+PassRefPtrWillBeRawPtr<Range> createRange(const EphemeralRange& range)
+{
+    if (range.isNull())
+        return nullptr;
+    return Range::create(range.document(), range.startPosition(), range.endPosition());
+}
+
 template class CORE_TEMPLATE_EXPORT EphemeralRangeTemplate<EditingStrategy>;
 template class CORE_TEMPLATE_EXPORT EphemeralRangeTemplate<EditingInComposedTreeStrategy>;
 
 } // namespace blink