6-1/ Integrate SplitScreen rotation flicker tests

Enable the rotation tests and aling the structure of WMShell
Flicker test cases

Bug: 169271943
Test: atest WMShellFlickerTests:RotateOneLaunchedAppTest
Test: atest WMShellFlickerTests:RotateTwoLaunchedAppTest

Change-Id: Ieeafc42562e99c5aa26547625b13ec2af35871c1
7 files changed