[media] Add SingleThreadTaskExecutor to web_media_player_sandbox #1463

Job	Run time
raspi-2 / initialize	45s
raspi-2-skia / initialize	48s
raspi-2 / docker-build-image	2m 21s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	2m 7s
raspi-2-skia / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	10m 22s
raspi-2-skia / raspi-2-skia_debug	15m 15s
raspi-2-skia / raspi-2-skia_qa	9m 28s
raspi-2-skia / raspi-2-skia_gold	9m 1s
raspi-2 / raspi_devel	13m 51s
raspi-2 / raspi_debug	13m 59s
raspi-2 / raspi_qa	10m 26s
raspi-2 / raspi_gold	9m 16s
raspi-2 / sbversion-15_devel	11m 9s
raspi-2 / sbversion-15_debug	16m 3s
raspi-2 / sbversion-15_qa	9m 20s
raspi-2 / sbversion-15_gold	8m 42s
raspi-2 / sbversion-16_devel	10m 1s
raspi-2 / sbversion-16_debug	14m 28s
raspi-2 / sbversion-16_qa	9m 19s
raspi-2 / sbversion-16_gold	9m 14s
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
	3h 5m 55s

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