Allow post-formats to be added as items, Jetpack WP.com REST API

diff --git a/json-endpoints/class.wpcom-json-api-get-site-endpoint.php b/json-endpoints/class.wpcom-json-api-get-site-endpoint.php
index e6f589f..1a259d3 100644
--- a/json-endpoints/class.wpcom-json-api-get-site-endpoint.php
+++ b/json-endpoints/class.wpcom-json-api-get-site-endpoint.php
@@ -444,19 +444,24 @@ class WPCOM_JSON_API_List_Post_Formats_Endpoint extends WPCOM_JSON_API_Endpoint
 			$this->load_theme_functions();
 		}
 
-		// Get a list of supported post formats.
-		$all_formats = get_post_format_strings();
-		$supported   = get_theme_support( 'post-formats' );
+		$args = array(
+			'child_of' => 0,
+			'exclude' => '',
+			'hide_empty' => false,
+			'hierarchical' => 0,
+			'order' => 'ASC',
+			'orderby' => 'name',
+			'pad_counts' => false,
+		);
 
-		$supported_formats = $response['formats'] = array();
+		$terms = get_terms( 'post_format', $args );
+		$formats = array();
 
-		if ( isset( $supported[0] ) ) {
-			foreach ( $supported[0] as $format ) {
-				$supported_formats[ $format ] = $all_formats[ $format ];
-			}
+		foreach ( $terms as $format ) {
+			$formats[$format->term_id] = $format->name;
 		}
 
-		$response['formats'] = (object) $supported_formats;
+		$response['formats'] = $formats;
 
 		return $response;
 	}