fix ScreenshotsOfProtectedBuffersFail
fix ScreenshotsOfProtectedBuffersFail

- put the test window at the front most screen position
- use RGBA_8888 which is a mandatory format
- handle devices that don't support the protected usage flags

Bug: 4950464

Change-Id: I0005fb667cfe094e5978816e2924b294c5ef817e

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base