Add socket watcher closure if no pending operations #15371

Job	Run time
raspi-2 / initialize	47s
raspi-2-skia / initialize	50s
raspi-2 / docker-build-image	1m 34s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	1m 32s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / raspi_devel	10m 8s
raspi-2 / raspi_debug	14m 45s
raspi-2 / raspi_qa	9m 1s
raspi-2 / raspi_gold	8m 46s
raspi-2 / sbversion-17_devel	10m 3s
raspi-2 / sbversion-17_debug	14m 24s
raspi-2 / sbversion-17_qa	9m 0s
raspi-2 / sbversion-17_gold	8m 35s
raspi-2-skia / raspi-2-skia_devel	10m 28s
raspi-2-skia / raspi-2-skia_debug	15m 18s
raspi-2-skia / raspi-2-skia_qa	9m 9s
raspi-2-skia / raspi-2-skia_gold	8m 56s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	2h 13m 16s

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