Blocks: Add the reusable block post type, wp_block.

Merges [43804] from the 5.0 branch to trunk.

See #45098.

Built from https://develop.svn.wordpress.org/trunk@44146


git-svn-id: http://core.svn.wordpress.org/trunk@43976 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post.php

@@ -252,6 +252,38 @@ function create_initial_post_types() {
 		)
 	);
 
+	register_post_type(
+		'wp_block',
+		array(
+			'labels'          => array(
+				'name'          => __( 'Blocks' ),
+				'singular_name' => __( 'Block' ),
+				'search_items'  => __( 'Search Blocks' ),
+			),
+			'public'          => false,
+			'_builtin'        => true, /* internal use only. don't use this when registering your own post type. */
+			'show_ui'         => true,
+			'show_in_menu'    => false,
+			'rewrite'         => false,
+			'capability_type' => 'block',
+			'capabilities'    => array(
+				// You need to be able to edit posts, in order to read blocks in their raw form.
+				'read'                   => 'edit_posts',
+				// You need to be able to publish posts, in order to create blocks.
+				'create_posts'           => 'publish_posts',
+				'edit_published_posts'   => 'edit_published_posts',
+				'delete_published_posts' => 'delete_published_posts',
+				'edit_others_posts'      => 'edit_others_posts',
+				'delete_others_posts'    => 'delete_others_posts',
+			),
+			'map_meta_cap'    => true,
+			'supports'        => array(
+				'title',
+				'editor',
+			),
+		)
+	);
+
 	register_post_status(
 		'publish',
 		array(