[Editing] Store |CommandSource| in |CompositeEditCommand|

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

Index: third_party/WebKit/Source/core/editing/commands/DragAndDropCommand.h
diff --git a/third_party/WebKit/Source/core/editing/commands/DragAndDropCommand.h b/third_party/WebKit/Source/core/editing/commands/DragAndDropCommand.h
index 180e357095173759b3b95c558f2b88a2c0acd66f..e3cea844df33014f0a0191149394ea1c7df0507a 100644
--- a/third_party/WebKit/Source/core/editing/commands/DragAndDropCommand.h
+++ b/third_party/WebKit/Source/core/editing/commands/DragAndDropCommand.h
@@ -16,15 +16,15 @@ namespace blink {
 // 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;