REST API: Support status=future for post update and creation.

Right now this is just an alias for "publish" and behaves exactly the same way (with a past date it will be published & back-dated; with no date it will be published immediately; with a future date it will be scheduled).

Merges r124520-wpcom.

json-endpoints.php

@@ -615,6 +615,7 @@
 			'private' => 'Privately publish the post.',
 			'draft'   => 'Save the post as a draft.',
 			'pending' => 'Mark the post as pending editorial approval.',
+			'future'  => 'Schedule the post (alias for publish; you must also set a future date).',
 			'auto-draft' => 'Save a placeholder for a newly created post, with no content.',
 		),
 		'sticky'    => array(
@@ -684,6 +685,7 @@
 			'private' => 'Privately publish the post.',
 			'draft'   => 'Save the post as a draft.',
 			'pending' => 'Mark the post as pending editorial approval.',
+			'future'  => 'Schedule the post (alias for publish; you must also set a future date).',
 			'auto-draft' => 'Save a placeholder for a newly created post, with no content.',
 		),
 		'sticky'    => array(
@@ -819,6 +821,7 @@
 			'publish' => 'Publish the post.',
 			'private' => 'Privately publish the post.',
 			'draft'   => 'Save the post as a draft.',
+			'future'  => 'Schedule the post (alias for publish; you must also set a future date).',
 			'pending' => 'Mark the post as pending editorial approval.',
 		),
 		'sticky'    => array(
@@ -884,6 +887,7 @@
 			'publish' => 'Publish the post.',
 			'private' => 'Privately publish the post.',
 			'draft'   => 'Save the post as a draft.',
+			'future'  => 'Schedule the post (alias for publish; you must also set a future date).',
 			'pending' => 'Mark the post as pending editorial approval.',
 		),
 		'sticky'    => array(

json-endpoints/class.wpcom-json-api-update-post-v1-1-endpoint.php

@@ -38,6 +38,11 @@ function write_post( $path, $blog_id, $post_id ) {
 			add_action( 'rest_api_inserted_post', array( $GLOBALS['publicize_ui']->publicize, 'async_publicize_post' ) );
 		}
 
+		// 'future' is an alias for 'publish' for now
+		if ( 'future' === $input['status'] ) {
+			$input['status'] = 'publish';
+		}
+
 		if ( $new ) {
 			$input = $this->input( true );
 

json-endpoints/class.wpcom-json-api-update-post-v1-2-endpoint.php

@@ -13,6 +13,11 @@ function write_post( $path, $blog_id, $post_id ) {
 			add_action( 'rest_api_inserted_post', array( $GLOBALS['publicize_ui']->publicize, 'async_publicize_post' ) );
 		}
 
+		// 'future' is an alias for 'publish' for now
+		if ( 'future' === $input['status'] ) {
+			$input['status'] = 'publish';
+		}
+
 		if ( $new ) {
 			$input = $this->input( true );