[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 "wtf/Assertions.h"
 #include <ostream>  // NOLINT
 
 namespace blink {
@@ skipping 85 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 {
+  if (m_base.isNull()) {
+    LOG(INFO) << "\nbase is null";
+    return;
+  }
+
+  LOG(INFO) << "\n"
+            << m_base.anchorNode()
+                   ->toMarkedTreeString(m_base.anchorNode(), "B",
+                                        m_extent.anchorNode(), "E")
+                   .utf8()
+                   .data()
+            << "base: " << m_base.toAnchorTypeAndOffsetString().utf8().data()
+            << "\n"
+            << "extent: "
+            << m_extent.toAnchorTypeAndOffsetString().utf8().data();
+}
+#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