Jeremy Felt c339798b49 Themes: Introduce responsive embeds support.
Responsive embeds is a way for a theme to opt in to WordPress dynamically scaling the width/height of an embed. When a theme supports responsive embeds, a `wp-embed-responsive` class is added to the `<body>` tag. This information is also presented through the REST API for clients to respect.

Merges [43790] and [43791] from the 5.0 branch to trunk.

Props desrosj, danielbachhuber, ocean90.
Fixes #45125.

Built from https://develop.svn.wordpress.org/trunk@44138


git-svn-id: http://core.svn.wordpress.org/trunk@43968 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-12-14 01:50:37 +00:00
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