[Editing] Store |CommandSource| in |CompositeEditCommand|

third_party/WebKit/Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 563 matching lines @@
 
   // For range to be null a WebKit client must have done something bad while
   // manually controlling drag behaviour
   if (!range)
     return false;
   ResourceFetcher* fetcher = range->ownerDocument().fetcher();
   ResourceCacheValidationSuppressor validationSuppressor(fetcher);
 
   // Start new Drag&Drop command group, invalidate previous command group.
   // Assume no other places is firing |DeleteByDrag| and |InsertFromDrop|.
-  innerFrame->editor().registerCommandGroup(
-      DragAndDropCommand::create(*innerFrame->document()));
+  innerFrame->editor().registerCommandGroup(DragAndDropCommand::create(
+      *innerFrame->document(), CommandSource::MenuOrKeyBinding));
 
   if (dragIsMove(innerFrame->selection(), dragData) ||
       dragCaret.isContentRichlyEditable()) {
     DragSourceType dragSourceType = DragSourceType::HTMLSource;
     DocumentFragment* fragment = documentFragmentFromDragData(
         dragData, innerFrame, range, true, dragSourceType);
     if (!fragment)
       return false;
 
     if (dragIsMove(innerFrame->selection(), dragData)) {
@@ skipping 636 matching lines @@
 }
 
 DEFINE_TRACE(DragController) {
   visitor->trace(m_page);
   visitor->trace(m_documentUnderMouse);
   visitor->trace(m_dragInitiator);
   visitor->trace(m_fileInputElementUnderMouse);
 }
 
 }  // namespace blink