Add a End-to-End test for Bug 166619182

To verify IME insets visiblity when switching to another activity with popup
dialog somehow IME insets control lost after focused back to original
activity.

Fix: 167936894
Test: atest KeyboardVisiblityControlTest#\
        testImeVisibilityWhenImeTransitionBetweenActivities_Full
Test: atest --instant KeyboardVisiblityControlTest#\
        testImeVisibilityWhenImeTransitionBetweenActivities_Instant

Change-Id: I4194c38cbf119ddb8af4670ed25ca911818bac5f
3 files changed