Started using a separate thread which calls startActivityAndWait
for starting apps. Also increased the minimum and maximum lengths
of time to wait for apps to stabilize.
Change-Id: I49935a0ed1d1c230e58dc1629e5e4da6b3887903
Each app uses a certain amount of memory when running in the
foreground. This test takes a list of app on the command line
starts them one at a time and reports the total PSS of the
app's process. The test allows to monitor memory usage over time.
Change-Id: I3411bd96cf7c7af10acbb8deeb9936469b810ea2