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

third_party/WebKit/Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 1239 matching lines @@
 void Editor::copyImage(const HitTestResult& result) {
   writeImageNodeToPasteboard(Pasteboard::generalPasteboard(),
                              result.innerNodeOrImageMapImage(),
                              result.altDisplayString());
 }
 
 bool Editor::canUndo() {
   return m_undoStack->canUndo();
 }
 
-// TODO(chongz): Fire 'beforeinput' for user triggered undo.
-void Editor::undo(EditCommandSource) {
-  m_undoStack->undo();
+void Editor::undo(EditCommandSource source) {
+  m_undoStack->undo(source);
 }
 
 bool Editor::canRedo() {
   return m_undoStack->canRedo();
 }
 
-// TODO(chongz): Fire 'beforeinput' for user triggered redo.
-void Editor::redo(EditCommandSource) {
-  m_undoStack->redo();
+void Editor::redo(EditCommandSource source) {
+  m_undoStack->redo(source);
 }
 
 void Editor::setBaseWritingDirection(WritingDirection direction) {
   Element* focusedElement = frame().document()->focusedElement();
   if (isTextControlElement(focusedElement)) {
     if (direction == NaturalWritingDirection)
       return;
     focusedElement->setAttribute(
         dirAttr, direction == LeftToRightWritingDirection ? "ltr" : "rtl");
     focusedElement->dispatchInputEvent();
@@ skipping 427 matching lines @@
 }
 
 DEFINE_TRACE(Editor) {
   visitor->trace(m_frame);
   visitor->trace(m_lastEditCommand);
   visitor->trace(m_undoStack);
   visitor->trace(m_mark);
 }
 
 }  // namespace blink