Cherry pick PR #3170: Migrate android media threads to pthread_create #120

Job	Run time
raspi-2 / initialize	41s
raspi-2-skia / initialize	47s
raspi-2 / docker-build-image	1m 27s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	1m 23s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / raspi_devel	9m 7s
raspi-2 / raspi_debug	12m 12s
raspi-2 / raspi_qa	8m 2s
raspi-2 / raspi_gold	7m 47s
raspi-2 / sbversion-15_devel	8m 38s
raspi-2 / sbversion-15_debug	16m 26s
raspi-2 / sbversion-15_qa	9m 50s
raspi-2 / sbversion-15_gold	7m 53s
raspi-2-skia / raspi-2-skia_devel	8m 38s
raspi-2-skia / raspi-2-skia_debug	12m 30s
raspi-2-skia / raspi-2-skia_qa	7m 40s
raspi-2-skia / raspi-2-skia_gold	7m 29s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	2h 0m 30s

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