Index: src/wp-includes/class-oembed.php
===================================================================
--- src/wp-includes/class-oembed.php    (revision 31300)
+++ src/wp-includes/class-oembed.php    (working copy)
@@ -67,6 +67,7 @@
            '#https?://(www\.)?mixcloud\.com/.*#i'                => array( 'http://www.mixcloud.com/oembed',                     true  ),
            '#https?://(www\.|embed\.)?ted\.com/talks/.*#i'       => array( 'http://www.ted.com/talks/oembed.{format}',           true  ),
            '#https?://(www\.)?(animoto|video214)\.com/play/.*#i' => array( 'http://animoto.com/oembeds/create',                  true  ),
+           '#https?://(.+)\.tumblr\.com/post/.*#i'               => array( 'https://www.tumblr.com/oembed/1.0',                  true  ),
        );

        if ( ! empty( self::$early_providers['add'] ) ) {
@@ -137,6 +138,7 @@
         * | YouTube      | youtube.com/playlist |  Yes  | 4.0.0     |
         * | ------------ | -------------------- | ----- | --------- |
         * | Vine         | vine.co              |  Yes  | 4.1.0     |
+        * | Tumblr       | tumblr.com           |  Yes  | 4.1.0     |
         * | ------------ | -------------------- | ----- | --------- |
         *
         * No longer supported providers: