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Currently the media::AudioDeviceThread is always created with
REALTIME_AUDIO thread priority. However, when calling from the new
Mirroring Service running in a sandboxed utility process (coming in
future CLs), the REALTIME_AUDIO priority is not allowed due to sandbox
syscall restrictions. Also, since the input audio data is buffered,
there is no need to use REALTIME_AUDIO thread for mirroring.

This CL allows media::AudioDeviceThread to be created with requested
thread priority. There should be no change to existing behavior.

Bug: 850352
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Id9e724b230e14c269f262c1c4c7e2b15ac08a57d
Reviewed-on: https://chromium-review.googlesource.com/1090226
Commit-Queue: Xiangjun Zhang <xjz@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565713}