Allow wp_enqueue_media() to "just work" in a customizer control.

props westonruter.
fixes #25618.

Built from https://develop.svn.wordpress.org/trunk@26589


git-svn-id: http://core.svn.wordpress.org/trunk@26479 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/css/media-views-rtl.css

@@ -98,6 +98,10 @@
 	z-index: 160000;
 }
 
+.wp-customizer .media-modal {
+	z-index: 560000;
+}
+
 .media-modal-backdrop {
 	position: fixed;
 	top: 0;
@@ -110,6 +114,10 @@
 	z-index: 159900;
 }
 
+.wp-customizer .media-modal-backdrop {
+	z-index: 559900;
+}
+
 .media-modal-close {
 	position: absolute;
 	text-decoration: none;

wp-includes/css/media-views.css

@@ -98,6 +98,10 @@
 	z-index: 160000;
 }
 
+.wp-customizer .media-modal {
+	z-index: 560000;
+}
+
 .media-modal-backdrop {
 	position: fixed;
 	top: 0;
@@ -110,6 +114,10 @@
 	z-index: 159900;
 }
 
+.wp-customizer .media-modal-backdrop {
+	z-index: 559900;
+}
+
 .media-modal-close {
 	position: absolute;
 	text-decoration: none;