Add sequence number to undo steps

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

 /*
  * Copyright (C) 2005, 2006, 2007, 2008 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 80 matching lines @@
 EditCommandComposition::EditCommandComposition(
     Document* document,
     const VisibleSelection& startingSelection,
     const VisibleSelection& endingSelection,
     InputEvent::InputType inputType)
     : m_document(document),
       m_startingSelection(startingSelection),
       m_endingSelection(endingSelection),
       m_startingRootEditableElement(startingSelection.rootEditableElement()),
       m_endingRootEditableElement(endingSelection.rootEditableElement()),
-      m_inputType(inputType) {}
+      m_inputType(inputType),
+      m_sequence(0) {}
 
 bool EditCommandComposition::belongsTo(const LocalFrame& frame) const {
   DCHECK(m_document);
   return m_document->frame() == &frame;
 }
 
 void EditCommandComposition::unapply() {
   DCHECK(m_document);
   LocalFrame* frame = m_document->frame();
   DCHECK(frame);
@@ skipping 31 matching lines @@
       command->doReapply();
   }
 
   frame->editor().reappliedEditing(this);
 }
 
 InputEvent::InputType EditCommandComposition::inputType() const {
   return m_inputType;
 }
 
+int EditCommandComposition::sequence() const {
+  return m_sequence;
+}
+
+void EditCommandComposition::setSequence(int sequence) {
+  m_sequence = sequence;
+}
+
 void EditCommandComposition::append(SimpleEditCommand* command) {
   m_commands.push_back(command);
 }
 
 void EditCommandComposition::append(EditCommandComposition* composition) {
   m_commands.appendVector(composition->m_commands);
 }
 
 void EditCommandComposition::setStartingSelection(
     const VisibleSelection& selection) {
@@ skipping 1867 matching lines @@
   return node;
 }
 
 DEFINE_TRACE(CompositeEditCommand) {
   visitor->trace(m_commands);
   visitor->trace(m_composition);
   EditCommand::trace(visitor);
 }
 
 }  // namespace blink