Integrate forceStop() in exit() that PIP window could really exit after each round of test Bug: 173567664 Test: atest com.android.wm.shell.flicker Test: atest com.android.server.wm.flicker.Flicker Change-Id: I8aaa4f590344f8fb1e6e731ed865f21f63892bb2
WM Shell Flicker Test Package
Please reference the following links
on what is Flicker Test and how to write a Flicker Test
To run the Flicker Tests for WM Shell, simply run atest WMShellFlickerTests