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

See #34432.


git-svn-id: https://develop.svn.wordpress.org/trunk@35383 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/customize/class-wp-customize-header-image-setting.php

@@ -0,0 +1,42 @@
+<?php
+/**
+ * WordPress Customize Setting classes
+ *
+ * @package WordPress
+ * @subpackage Customize
+ * @since 4.4.0
+ */
+
+/**
+ * A setting that is used to filter a value, but will not save the results.
+ *
+ * Results should be properly handled using another setting or callback.
+ *
+ * @since 3.4.0
+ *
+ * @see WP_Customize_Setting
+ */
+final class WP_Customize_Header_Image_Setting extends WP_Customize_Setting {
+	public $id = 'header_image_data';
+
+	/**
+	 * @since 3.4.0
+	 *
+	 * @global Custom_Image_Header $custom_image_header
+	 *
+	 * @param $value
+	 */
+	public function update( $value ) {
+		global $custom_image_header;
+
+		// If the value doesn't exist (removed or random),
+		// use the header_image value.
+		if ( ! $value )
+			$value = $this->manager->get_setting('header_image')->post_value();
+
+		if ( is_array( $value ) && isset( $value['choice'] ) )
+			$custom_image_header->set_header_image( $value['choice'] );
+		else
+			$custom_image_header->set_header_image( $value );
+	}
+}