Merge "Register policy with AudioManager"

            AudioPolicy audioPolicy = new AudioPolicy.Builder(/*context=*/ null)

                    .setMediaProjection(projection)

                    .addMix(audioMix).build();

            int error = AudioManager.registerAudioPolicyStatic(audioPolicy);

            if (error != 0) {

                throw new UnsupportedOperationException("Error: could not register audio policy");

            }

            AudioRecord record = audioPolicy.createAudioRecordSink(audioMix);

            if (record == null) {

                throw new UnsupportedOperationException("Cannot create AudioRecord");

            }

            record.unregisterAudioPolicyOnRelease(audioPolicy);

            return record;

        }