Bug 1523562 [wpt PR 15095] - Update interfaces/picture-in-picture.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/picture-in-picture.idl (#15095)

Source: https://github.com/tidoust/reffy-reports/blob/71768cc/whatwg/idl/picture-in-picture.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/484671880
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wpt-commits: f33a54b1f9e2cf8a15e1ca06f123f61f3564ab61
wpt-pr: 15095

testing/web-platform/tests/interfaces/picture-in-picture.idl

@@ -9,6 +9,7 @@ partial interface HTMLVideoElement {
   attribute EventHandler onenterpictureinpicture;
   attribute EventHandler onleavepictureinpicture;
 
+  [CEReactions] attribute boolean autoPictureInPicture;
   [CEReactions] attribute boolean disablePictureInPicture;
 };