[Editing] Store |CommandSource| in |CompositeEditCommand|

third_party/WebKit/Source/core/editing/commands/SplitTextNodeContainingElementCommand.cpp

Index: third_party/WebKit/Source/core/editing/commands/SplitTextNodeContainingElementCommand.cpp
diff --git a/third_party/WebKit/Source/core/editing/commands/SplitTextNodeContainingElementCommand.cpp b/third_party/WebKit/Source/core/editing/commands/SplitTextNodeContainingElementCommand.cpp
index a4157b5d7e59474e64ffd7ea6209cce7b8bfc598..6df55f35c7959fcbee4c610b52215cdfc1bcf6c2 100644
--- a/third_party/WebKit/Source/core/editing/commands/SplitTextNodeContainingElementCommand.cpp
+++ b/third_party/WebKit/Source/core/editing/commands/SplitTextNodeContainingElementCommand.cpp
@@ -34,9 +34,12 @@
 namespace blink {
 
 SplitTextNodeContainingElementCommand::SplitTextNodeContainingElementCommand(
+    CommandSource source,
     Text* text,
     int offset)
-    : CompositeEditCommand(text->document()), m_text(text), m_offset(offset) {
+    : CompositeEditCommand(text->document(), source),
+      m_text(text),
+      m_offset(offset) {
   DCHECK(m_text);
   DCHECK_GT(m_text->length(), 0u);
 }