Extend AutoShowTest to test the behavior of combining various
softInputMode flags:
* SOFT_INPUT_STATE_UNSPECIFIED
* SOFT_INPUT_STATE_HIDDEN
* SOFT_INPUT_STATE_ALWAYS_HIDDEN
* SOFT_INPUT_STATE_VISIBLE
* SOFT_INPUT_STATE_ALWAYS_VISIBLE
softInput adjustment flags:
* SOFT_INPUT_ADJUST_UNSPECIFIED
* SOFT_INPUT_ADJUST_RESIZE
* SOFT_INPUT_ADJUST_PAN
* SOFT_INPUT_ADJUST_NOTHING
set or not set:
* SOFT_INPUT_IS_FORWARD_NAVIGATION
Flag SOFT_INPUT_STATE_UNCHANGED was not included for now as it requires
more than one activities.
Bug: 242838873
Bug: 77152727
Test: atest InputMethodStressTest
Change-Id: I21ef8073d0b6a582c108141000e23847be6daf33
d0091597f7