Add RepositionFixedPortraitAppTest

Add helpers to reposition app and wait for app to move to expected
bounds. Remove rotation configuration from BaseAppCompat and define in
test instead.

Fix: 283773197
Test: atest WMShellFlickerTests:RepositionFixedPortraitAppTest
Change-Id: Ifae79ba244cc62419c9ea7b5b86fb9528055a3cc
6 files changed