[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 33 matching lines @@
 
 class EditCommandComposition final : public UndoStep {
 public:
     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(); }
     Element* endingRootEditableElement() const { return m_endingRootEditableElement.get(); }
 
     DECLARE_VIRTUAL_TRACE();
 
@@ skipping 14 matching lines @@
     enum ShouldPreserveSelection { PreserveSelection, DoNotPreserveSelection };
     enum ShouldPreserveStyle { PreserveStyle, DoNotPreserveStyle };
 
     ~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 preservesTypingStyle() const;
     virtual void setShouldRetainAutocorrectionIndicator(bool);
     virtual bool shouldStopCaretBlinking() const { return false; }
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
@@ skipping 81 matching lines @@
     bool isCompositeEditCommand() const final { return true; }
 
     Member<EditCommandComposition> m_composition;
 };
 
 DEFINE_TYPE_CASTS(CompositeEditCommand, EditCommand, command, command->isCompositeEditCommand(), command.isCompositeEditCommand());
 
 } // namespace blink
 
 #endif // CompositeEditCommand_h