Out-of-line trace() methods of editing template types.

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

Index: third_party/WebKit/Source/core/editing/SelectionTemplate.cpp
diff --git a/third_party/WebKit/Source/core/editing/SelectionTemplate.cpp b/third_party/WebKit/Source/core/editing/SelectionTemplate.cpp
index 0b9056a272805b0650f15fbd1fa299e20658f00b..bef173de717231eeaf229a9f5a90d987bb468d95 100644
--- a/third_party/WebKit/Source/core/editing/SelectionTemplate.cpp
+++ b/third_party/WebKit/Source/core/editing/SelectionTemplate.cpp
@@ -55,6 +55,12 @@ bool SelectionTemplate<Strategy>::operator!=(
 }
 
 template <typename Strategy>
+DEFINE_TRACE(SelectionTemplate<Strategy>) {
+  visitor->trace(m_base);
+  visitor->trace(m_extent);
+}
+
+template <typename Strategy>
 const PositionTemplate<Strategy>& SelectionTemplate<Strategy>::base() const {
   DCHECK(assertValid());
   DCHECK(!m_base.isOrphan()) << m_base;