WordPress customizer_register TinyMCE control

gistfile1.php

function register_theme_customizer() {
        $wp_customize->add_section( 'editor', array(
            'title' => 'Editeur',
            'description' => 'Editeur TinyMCE',
            'priority' => 300
        ) );

        $wp_customize->add_setting( 'theme[editor_content]', array(
            'default' => '',
            'transport' => 'postMessage',
            'sanitize_callback' => 'wp_kses_post'
        ) );

        $wp_customize->add_control( new Text_Editor_Custom_Control( $wp_customize, 'editor_content', array(
            'label' => 'Contenu',
            'section' => 'editor',
            'settings' => 'cornettes[editor_content]',
            'type' => 'textarea'
        ) ) );
}
add_action ( 'customize_register', 'register_theme_customizer' );