Made CopyFile funtion public so code using TargetDeviceAndroid can use it.
#ROBOMERGE-OWNER: lina.halper
#ROBOMERGE-AUTHOR: andrew.grant
#ROBOMERGE-SOURCE: CL 6650548 via CL 6650549 via CL 6650550 via CL 6650600 via CL 6650603
#ROBOMERGE-BOT: ANIM (Main -> Dev-Anim) (v365-6733468)
[CL 6758799 by andrew grant in Dev-Anim branch]