Joe McGill b5563ef917 Themes: Improve a11y and extendability of custom video headers.
This adds play/pause controls to video headers, along with voice
assistance, using `wp.a11y.speak`, to make custom video headers more
accessible. To make styling the play/pause button easier for themes,
CSS has been omitted from the default implementation.

This also includes a refactor of the `wp.customHeader` code to introduce
a `BaseHandler` class, which can be extended by plugins and themes to modify
or enhance the default video handlers.

Props davidakennedy, afercia, bradyvercher, joemcgill, adamsilverstein, rianrietveld.
Fixes #38678.

git-svn-id: https://develop.svn.wordpress.org/trunk@39272 602fd350-edb4-49c9-b593-d223f7449a82
2016-11-16 23:25:28 +00:00
2016-09-06 18:12:09 +00:00
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