[Editing] Introduce |EditCommandComposition::willUn/Reapply()| in prepare for 'beforeinput' (2/3)

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

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 
 #ifndef UndoStack_h
 #define UndoStack_h
 
 #include "platform/heap/Handle.h"
 #include "wtf/Deque.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
+enum class EditCommandSource;
 class LocalFrame;
 class UndoStep;
 
 // |UndoStack| is owned by and always 1:1 to |Editor|. Since |Editor| is 1:1 to
 // |LocalFrame|, |UndoStack| is also 1:1 to |LocalFrame|.
 class UndoStack final : public GarbageCollected<UndoStack> {
   WTF_MAKE_NONCOPYABLE(UndoStack);
 
  public:
   static UndoStack* create();
 
   void registerUndoStep(UndoStep*);
   void registerRedoStep(UndoStep*);
   bool canUndo() const;
   bool canRedo() const;
-  void undo();
-  void redo();
+  void undo(EditCommandSource);
+  void redo(EditCommandSource);
   void clear();
 
   DECLARE_TRACE();
 
  private:
   UndoStack();
 
   typedef HeapDeque<Member<UndoStep>> UndoStepStack;
 
   bool m_inRedo;
   UndoStepStack m_undoStack;
   UndoStepStack m_redoStack;
 };
 
 }  // namespace blink
 
 #endif