Add OWNERS file in media/audio/fuchsia

Bug: 737802
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I19a1edacd4cda27c06f4df631bea9a0b2f9e6a2c
Reviewed-on: https://chromium-review.googlesource.com/690626
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506948}

media/audio/fuchsia/OWNERS

+file://build/fuchsia/OWNERS