Update/Install: Trigger a JS event when updating a theme.

For plugins a `'wp-plugin-updating'` event is triggered, for themes there's now the `'wp-theme-updating'` equivalent.

Props DavidAnderson.
Fixes #37216.
Built from https://develop.svn.wordpress.org/trunk@37970


git-svn-id: http://core.svn.wordpress.org/trunk@37911 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/updates.js

@@ -886,6 +886,8 @@
 		wp.a11y.speak( wp.updates.l10n.updatingMsg, 'polite' );
 		$notice.text( wp.updates.l10n.updating );
 
+		$document.trigger( 'wp-theme-updating' );
+
 		return wp.updates.ajax( 'update-theme', args );
 	};
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta1-37969';
+$wp_version = '4.6-beta1-37970';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.