[Editing] Add SelectionTemplate::showTreeForThis()

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

Index: third_party/WebKit/Source/core/editing/VisibleSelection.cpp
diff --git a/third_party/WebKit/Source/core/editing/VisibleSelection.cpp b/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
index c2dac8421a0b8aeb429250c91966d3afb40fa4b8..7b2a7da45a27dfd42e2b7cf61602c4125603d94a 100644
--- a/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
+++ b/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
@@ -777,23 +777,27 @@ bool VisibleSelectionTemplate<Strategy>::operator==(
 }
 
 #ifndef NDEBUG
-
 template <typename Strategy>
-void VisibleSelectionTemplate<Strategy>::showTreeForThis() const {
-  if (!start().anchorNode())
+void VisibleSelectionTemplate<Strategy>::showTreeForStartAndEnd(
+    const PositionTemplate<Strategy>& start,
+    const PositionTemplate<Strategy>& end) {
+  if (!start.anchorNode())
     return;
   LOG(INFO) << "\n"
-            << start()
-                   .anchorNode()
-                   ->toMarkedTreeString(start().anchorNode(), "S",
-                                        end().anchorNode(), "E")
+            << start.anchorNode()
+                   ->toMarkedTreeString(start.anchorNode(), "S",
+                                        end.anchorNode(), "E")
                    .utf8()
                    .data()
-            << "start: " << start().toAnchorTypeAndOffsetString().utf8().data()
+            << "start: " << start.toAnchorTypeAndOffsetString().utf8().data()
             << "\n"
-            << "end: " << end().toAnchorTypeAndOffsetString().utf8().data();
+            << "end: " << end.toAnchorTypeAndOffsetString().utf8().data();
 }
 
+template <typename Strategy>
+void VisibleSelectionTemplate<Strategy>::showTreeForThis() const {
+  VisibleSelectionTemplate<Strategy>::showTreeForStartAndEnd(start(), end());
+}
 #endif
 
 template <typename Strategy>