Allow file sharing from AppRTCMobile app.
Allow file sharing from AppRTCMobile app.

This is required for the bots to get files off devices after
running tests.

Bug: webrtc:8316
Change-Id: If48d7b95c1a3aa54e7ee07e7f2a75e6bc88e184a
Reviewed-on: https://webrtc-review.googlesource.com/5400
Reviewed-by: Daniela Jovanoska Petrenko <04611c2bad9f7f7be45519b63c4a473700167626@webrtc.org>
Commit-Queue: Kári Helgason <79949f6d84ac41ff1f64c59fd5a554be5ff12a02@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#20067}
ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc