Customizer: Restrict image control uploaders to only allow image file types. see #22149.

git-svn-id: https://develop.svn.wordpress.org/trunk@22492 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/class-wp-customize-control.php

@@ -402,6 +402,7 @@ class WP_Customize_Upload_Control extends WP_Customize_Control {
 	public $type    = 'upload';
 	public $removed = '';
 	public $context;
+	public $extensions;
 
 	/**
 	 * Enqueue control related scripts/styles.
@@ -425,6 +426,9 @@ class WP_Customize_Upload_Control extends WP_Customize_Control {
 
 		if ( $this->context )
 			$this->json['context'] = $this->context;
+
+		if ( $this->extensions )
+			$this->json['extensions'] = $this->extensions;
 	}
 
 	/**
@@ -456,6 +460,7 @@ class WP_Customize_Image_Control extends WP_Customize_Upload_Control {
 	public $type = 'image';
 	public $get_url;
 	public $statuses;
+	public $extensions = 'jpg,jpeg,gif,png';
 
 	protected $tabs = array();
 

wp-includes/script-loader.php

@@ -313,6 +313,9 @@ function wp_default_scripts( &$scripts ) {
 		'cancel'    => __( 'Cancel' ),
 		'close'     => __( 'Close' ),
 		'cheatin'   => __( 'Cheatin’ uh?' ),
+
+		// Used for overriding the file types allowed in plupload.
+		'allowedFiles' => __( 'Allowed Files' ),
 	) );
 
 	$scripts->add( 'media-models', "/wp-includes/js/media-models$suffix.js", array( 'backbone', 'jquery' ), false, 1 );