Launch SplitActivityLifecycleTest test activities in fullscreen

Launch mOwnerActivity(ActivityA) of the SplitActivityLifecycleTest in
fullscreen to fix failures on devices which use freeform as the default
windowing mode, such as cuttlefish_pc and arc++.
`testTranslucentAdjacentTaskFragment` and
`testActivityLaunchInExpandedTaskFragment` are failing on these devices
because both tests create two activities and expect the first one is
occluded by the second one while setting up the test, but, two
activities are partially overlapped when they are launched in freeform.
Thus, Launch the mOwnerActivity in fullscreen to avoid the issue, other
tests activities' parameters depend on mOwnerActivity so that other
activities will be in the corect size and position.

Bug: 211786060
Test: atest SplitActivityLifecycleTest on devices on devices with
freeform default windowing mode

Change-Id: Idf4e346c7c685e0a4e405a77ec0390e67ce163cd
(cherry picked from commit 21fb96bdc376b8536cad1f591b398f89dc7f9b9a)
1 file changed