command          4191 Source/core/dom/Document.cpp static Editor::Command command(Document* document, const String& commandName, bool userInterface = false)
command          1651 Source/core/editing/EditorCommand.cpp Editor::Command Editor::command(const String& commandName)
command          1656 Source/core/editing/EditorCommand.cpp Editor::Command Editor::command(const String& commandName, EditorCommandSource source)