[Editing] Add SelectionTemplate::showTreeForThis()

third_party/WebKit/Source/core/editing/SelectionTemplate.cpp

 // Copyright 2016 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 "core/editing/SelectionTemplate.h"
 
+#include "core/editing/VisibleSelection.h"
 #include "wtf/Assertions.h"
 #include <ostream>  // NOLINT
 
 namespace blink {
 
 template <typename Strategy>
 SelectionTemplate<Strategy>::SelectionTemplate(const SelectionTemplate& other)
     : m_base(other.m_base),
       m_extent(other.m_extent),
       m_affinity(other.m_affinity),
@@ skipping 79 matching lines @@
   DCHECK_EQ(m_base.document(), m_extent.document());
   return true;
 }
 #else
 template <typename Strategy>
 bool SelectionTemplate<Strategy>::assertValid() const {
   return true;
 }
 #endif
 
+#ifndef NDEBUG
+template <typename Strategy>
+void SelectionTemplate<Strategy>::showTreeForThis() const {
+  VisibleSelectionTemplate<Strategy>::showTreeForStartAndEnd(m_base, m_extent);

[yosin_UTC9, 2016/11/28 07:56:27]

We don't want to make |SelectionTemplate| to dependent to |VisibleSelection|.

There are two options:
 - VisibleSelection::showTreeForThis() to call
SelectionTemplate::showTreeForThis()
 - Barand new SelectionTemplate::showTreeForThis(), e.g. "S" and "E" marks
aren't meaningful for |SelectionTemplate| which doesn't have "start" and "end".

+}
+#endif
+
 template <typename Strategy>
 void SelectionTemplate<Strategy>::printTo(std::ostream* ostream,
                                           const char* type) const {
   if (isNone()) {
     *ostream << "()";
     return;
   }
   *ostream << type << '(';
 #if DCHECK_IS_ON()
   if (m_domTreeVersion != m_base.document()->domTreeVersion()) {
@@ skipping 146 matching lines @@
 SelectionTemplate<Strategy>::Builder::setIsDirectional(bool isDirectional) {
   m_selection.m_isDirectional = isDirectional;
   return *this;
 }
 
 template class CORE_TEMPLATE_EXPORT SelectionTemplate<EditingStrategy>;
 template class CORE_TEMPLATE_EXPORT
     SelectionTemplate<EditingInFlatTreeStrategy>;
 
 }  // namespace blink