Add activity to show the result of tests.

When testing a real MTP device, we cannot obtain test results by using the USB
port because the USB port is occupied by the MTP devcie. The CL adds an activity
to test package that shows test results.

BUG=23536467

Change-Id: I0e53c2de122cb3afd52f22bedd93ece53aaeb525
3 files changed