Revert "Removed unused class and its test"

This adds back the SurfaceMediaSource class, needed for WFD.

This reverts commit e8859152.

Change-Id: I3f67d01f18441e49205e2e263d20f0fb6fc91fe6
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: DennySPb <dennyspb@gmail.com>