Added the WMS.mirrorDisplay API to mirror a specified displayId. The request requires the ACCESS_SURFACE_FLINGER permission. Added a sample app to demonstrate the useablility of this API and different ways the mirror SurfaceControl can be used. Test: mmma tests/MirrorSurfaceTest and install apk Bug: 131622422 Change-Id: Ic86115786d37473650b3c7ed39cba0bd4c65b281