Screenrecord: Export RecordingService for External Usage

[nullxception: simplify start handling and adapt it to 12L]
[neobuddy89: Adapted to 13]

Change-Id: I58be35cce6bf5a9706fce89327df5e215ca3f9bc
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
4 files changed