Andrew Nacin 84b9ec9070 Customizer: Add _wp_attachment_is_custom_background meta to uploaded background images.
Merges [30885] to the 4.1 branch.

props ocean90.
fixes #30707.

Built from https://develop.svn.wordpress.org/branches/4.1@30931


git-svn-id: http://core.svn.wordpress.org/branches/4.1@30920 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2014-12-16 21:29:22 +00:00
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