Media: Ensure variables in the attachment details template have defined defaults.

* Adds styling to the upload progress bar in the attachment details template.
* Defines the `filename` attribute when Plupload creates the client-side `Attachment` model.

fixes #22410, see #21390.


git-svn-id: http://core.svn.wordpress.org/trunk@22543 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/css/media-views.css

@@ -933,6 +933,16 @@
 	margin-bottom: 5px;
 }
 
+.uploading .attachment-info .thumbnail {
+	width: 120px;
+	height: 80px;
+	box-shadow: inset 0 0 15px rgba( 0, 0, 0, 0.1 );
+}
+
+.uploading .attachment-info .media-progress-bar {
+	margin-top: 32px;
+}
+
 .attachment-info .thumbnail:after {
 	content: '';
 	display: block;