[Editing] Store |CommandSource| in |CompositeEditCommand|

third_party/WebKit/Source/core/editing/commands/InsertLineBreakCommand.h

Index: third_party/WebKit/Source/core/editing/commands/InsertLineBreakCommand.h
diff --git a/third_party/WebKit/Source/core/editing/commands/InsertLineBreakCommand.h b/third_party/WebKit/Source/core/editing/commands/InsertLineBreakCommand.h
index 6339943a4b4203537c235d90e825a8f6c8f2458b..607ae6211fcbe7b719cdd14df3f1b2dbcaa22791 100644
--- a/third_party/WebKit/Source/core/editing/commands/InsertLineBreakCommand.h
+++ b/third_party/WebKit/Source/core/editing/commands/InsertLineBreakCommand.h
@@ -32,12 +32,13 @@ namespace blink {
 
 class InsertLineBreakCommand final : public CompositeEditCommand {
  public:
-  static InsertLineBreakCommand* create(Document& document) {
-    return new InsertLineBreakCommand(document);
+  static InsertLineBreakCommand* create(Document& document,
+                                        CommandSource source) {
+    return new InsertLineBreakCommand(document, source);
   }
 
  private:
-  explicit InsertLineBreakCommand(Document&);
+  InsertLineBreakCommand(Document&, CommandSource);
 
   void doApply(EditingState*) override;