alwu 0d200dff8a Bug 1640998 - part7 : create MediaController webidl. r=chunmin,smaug
This patch will
- create a chrome-only webdil interface `MediaController`
- expose supported keys via `MediaController` webidl interface

The advantage of doing so are
- to have a dedicated interface that is only used for MediaController that can be used for testing and our future plan (media hub)

More Details :
Currently, we access media controller's from `ChromeUtils` [1], but it causes a problem of creating a duplicated enum of the enum which we want to expose into Chrome JS.

Instead, we should create a media controller interface to access all its attibutes, which is more easier and clean.

In addition, we're planning to have a something like Chrome's media hub [2]. In order to do that, we have to expose some JS methods to allow us to control playback directly from Chrome JS.

[1] https://searchfox.org/mozilla-central/rev/559b25eb41c1cbffcb90a34e008b8288312fcd25/dom/chrome-webidl/ChromeUtils.webidl#485-493
[2] https://blog.google/products/chrome/manage-audio-and-video-in-chrome/

Differential Revision: https://phabricator.services.mozilla.com/D77757
2020-06-08 18:51:12 +00:00
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