[InputEvent] Support |deleteByDrag|, |insertFromDrop| and fire in sequential order

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

 /*
  * Copyright (C) 2005, 2006, 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 36 matching lines @@
   static EditCommandComposition* create(Document*,
                                         const VisibleSelection&,
                                         const VisibleSelection&,
                                         InputEvent::InputType);
 
   bool belongsTo(const LocalFrame&) const override;
   void unapply() override;
   void reapply() override;
   InputEvent::InputType inputType() const override;
   void append(SimpleEditCommand*);
+  void append(EditCommandComposition*);
 
   const VisibleSelection& startingSelection() const {
     return m_startingSelection;
   }
   const VisibleSelection& endingSelection() const { return m_endingSelection; }
   void setStartingSelection(const VisibleSelection&);
   void setEndingSelection(const VisibleSelection&);
   Element* startingRootEditableElement() const {
     return m_startingRootEditableElement.get();
   }
@@ skipping 25 matching lines @@
 
   ~CompositeEditCommand() override;
 
   // Returns |false| if the command failed.  e.g. It's aborted.
   bool apply();
   bool isFirstCommand(EditCommand* command) {
     return !m_commands.isEmpty() && m_commands.first() == command;
   }
   EditCommandComposition* composition() { return m_composition.get(); }
   EditCommandComposition* ensureComposition();
+  // Append composition from an already applied command.
+  void appendCommandToComposite(CompositeEditCommand*);
 
   virtual bool isReplaceSelectionCommand() const;
   virtual bool isTypingCommand() const;
+  virtual bool isCommandGroupWrapper() const;
+  virtual bool isDragAndDropCommand() const;
   virtual bool preservesTypingStyle() const;
   virtual void setShouldRetainAutocorrectionIndicator(bool);
   virtual bool shouldStopCaretBlinking() const { return false; }
 
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   explicit CompositeEditCommand(Document&);
 
   //
@@ skipping 149 matching lines @@
 
 DEFINE_TYPE_CASTS(CompositeEditCommand,
                   EditCommand,
                   command,
                   command->isCompositeEditCommand(),
                   command.isCompositeEditCommand());
 
 }  // namespace blink
 
 #endif  // CompositeEditCommand_h