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

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

 /*
  * Copyright (C) 2006, 2007 Apple, Inc.  All rights reserved.
  * Copyright (C) 2012 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:
  * 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 46 matching lines @@
 }
 
 bool UndoStack::canUndo() const {
   return !m_undoStack.isEmpty();
 }
 
 bool UndoStack::canRedo() const {
   return !m_redoStack.isEmpty();
 }
 
-void UndoStack::undo() {
+void UndoStack::undo(EditCommandSource source) {
   if (canUndo()) {
     UndoStepStack::iterator back = --m_undoStack.end();
     UndoStep* step(back->get());
     m_undoStack.remove(back);
-    step->unapply();
+    step->unapply(source);
     // unapply will call us back to push this command onto the redo stack.
   }
 }
 
-void UndoStack::redo() {
+void UndoStack::redo(EditCommandSource source) {
   if (canRedo()) {
     UndoStepStack::iterator back = --m_redoStack.end();
     UndoStep* step(back->get());
     m_redoStack.remove(back);
 
     DCHECK(!m_inRedo);
     AutoReset<bool> redoScope(&m_inRedo, true);
-    step->reapply();
+    step->reapply(source);
     // reapply will call us back to push this command onto the undo stack.
   }
 }
 
 void UndoStack::clear() {
   m_undoStack.clear();
   m_redoStack.clear();
 }
 
 DEFINE_TRACE(UndoStack) {
   visitor->trace(m_undoStack);
   visitor->trace(m_redoStack);
 }
 
 }  // namespace blink