check multi-window support in Pic-In-Pic test case

This Picture-In-Picture test case don't consider the case that platform has
picture-in-picture feature but don't support multi-window. In AMS,
"mSupportsPictureInPicture" is set as true when
it has picture-in-picture feature and supports multi-window.

In this failed case, platform has picture-in-picture feature but don't
support multi-window, the "mSupportsPictureInPicture" is flase , so
VideoPlayerActivity
will be launched failed in picture-in-picture mode in this test case,
which cause test case failed.

So, we should add multi-window supported check in this test case.

Bug: 111424530
Test: cts
Change-Id: I9a2821e75205c39c31a2d62f6d5eb435fa4398b4
1 file changed