For auto enter PiP from landscape when no source rect hint is specified,
we should actually use the skew instead scale values to set the matrix
transform.
Video: http://recall/-/aaaaaabFQoRHlzixHdtY/dpLVOQzIVjdJpn5kg7T4Fc
Bug: 179720719
Test: manual use ApiDemos app, see video
Change-Id: Ic7072e8354329584f9cb75876911c3d58d78e7f5