Ben Lin ca25625601 Add Activity#onPictureInPictureUiStateChanged and PictureInPictureUiState.
This adds a new API on Activity such that app developers can get signals
when certain PiP UI states change, e.g. stash/unstashed. The idea is that
when PiP is stashed, the activity will get a signal to do anything they
wish, such as pausing/resuming video-like contents.

Bug: 182409584
Test: atest PinnedStackTests#testPictureInPictureStateChangeCallback
Change-Id: I308f3f1c3af8d1a54b63311fb3beaee77d6c7922
2021-04-15 13:42:17 -07:00
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2021-04-09 11:21:33 -07:00
2021-04-12 17:55:12 +00:00
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2021-04-12 18:39:33 +01:00
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