[Editing] Store |CommandSource| in |CompositeEditCommand|

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

 // 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.
 
 #ifndef DragAndDropCommand_h
 #define DragAndDropCommand_h
 
 #include "core/editing/commands/CompositeEditCommand.h"
 
 namespace blink {
 
 // |DragAndDropCommand| is a dummy command. It doesn't do anything by itself,
 // but will act as a catcher for the following |DeleteByDrag| and
 // |InsertFromDrop| commands, and combine them into a single undo entry.
 // In the future when necessary, this mechanism can be generalized into a common
 // command wrapper to achieve undo group.
 class DragAndDropCommand final : public CompositeEditCommand {
  public:
-  static DragAndDropCommand* create(Document& document) {
-    return new DragAndDropCommand(document);
+  static DragAndDropCommand* create(Document& document, CommandSource source) {
+    return new DragAndDropCommand(document, source);
   }
 
   bool isCommandGroupWrapper() const override;
   bool isDragAndDropCommand() const override;
 
  private:
-  explicit DragAndDropCommand(Document&);
+  DragAndDropCommand(Document&, CommandSource);
 
   void doApply(EditingState*) override;
   InputEvent::InputType inputType() const override;
 };
 
 }  // namespace blink
 
 #endif  // DragAndDropCommand_h