Customize: move WP_Customize_Section subclasses to wp-includes/customize, they load in the exact same place.

See #34432.


git-svn-id: https://develop.svn.wordpress.org/trunk@35385 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/customize/class-wp-customize-new-menu-section.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Customize API: WP_Customize_New_Menu_Section class
+ *
+ * @package WordPress
+ * @subpackage Customize
+ * @since 4.4.0
+ */
+
+/**
+ * Customize Menu Section Class
+ *
+ * Implements the new-menu-ui toggle button instead of a regular section.
+ *
+ * @since 4.3.0
+ *
+ * @see WP_Customize_Section
+ */
+class WP_Customize_New_Menu_Section extends WP_Customize_Section {
+
+	/**
+	 * Control type.
+	 *
+	 * @since 4.3.0
+	 * @access public
+	 * @var string
+	 */
+	public $type = 'new_menu';
+
+	/**
+	 * Render the section, and the controls that have been added to it.
+	 *
+	 * @since 4.3.0
+	 * @access protected
+	 */
+	protected function render() {
+		?>
+		<li id="accordion-section-<?php echo esc_attr( $this->id ); ?>" class="accordion-section-new-menu">
+			<button type="button" class="button-secondary add-new-menu-item add-menu-toggle" aria-expanded="false">
+				<?php echo esc_html( $this->title ); ?>
+			</button>
+			<ul class="new-menu-section-content"></ul>
+		</li>
+		<?php
+	}
+}