Revisions: add a `'wp_prepare_revision_for_js'` filter.

Props jtsternberg, adamsilverstein.
Fixes #28627.

Built from https://develop.svn.wordpress.org/trunk@34541


git-svn-id: http://core.svn.wordpress.org/trunk@34505 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/revision.php

@@ -199,7 +199,7 @@ function wp_prepare_revisions_for_js( $post, $selected_revision_id, $from = null
 			$current_id = $revision->ID;
 		}
 
-		$revisions[ $revision->ID ] = array(
+		$revisions_data = array(
 			'id'         => $revision->ID,
 			'title'      => get_the_title( $post->ID ),
 			'author'     => $authors[ $revision->post_author ],
@@ -210,6 +210,16 @@ function wp_prepare_revisions_for_js( $post, $selected_revision_id, $from = null
 			'current'    => $current,
 			'restoreUrl' => $can_restore ? $restore_link : false,
 		);
+
+		/**
+		 * Filter the array of revisions used on the revisions screen.
+		 *
+		 * @since 4.4.0
+		 *
+		 * @param array   $revisions_data The bootstrapped data for the revisions screen.
+		 * @param WP_Post $post           The revision's parent WP_Post object.
+		 */
+		$revisions[ $revision->ID ] = apply_filters( 'wp_prepare_revision_for_js', $revisions_data, $post );
 	}
 
 	/**

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34540';
+$wp_version = '4.4-alpha-34541';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.