Add socket watcher closure if no pending operations #2400

Job	Run time
raspi-2 / initialize	33s
raspi-2-skia / initialize	29s
raspi-2-skia / docker-build-image	1m 59s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	1m 47s
raspi-2 / docker-unittest-image	0s
raspi-2 / raspi_devel	10m 29s
raspi-2 / raspi_debug	13m 42s
raspi-2 / raspi_qa	9m 8s
raspi-2 / raspi_gold	8m 27s
raspi-2 / sbversion-15_devel	11m 41s
raspi-2 / sbversion-15_debug	13m 56s
raspi-2 / sbversion-15_qa	8m 39s
raspi-2 / sbversion-15_gold	8m 14s
raspi-2-skia / raspi-2-skia_devel	7m 38s
raspi-2-skia / raspi-2-skia_debug	13m 27s
raspi-2-skia / raspi-2-skia_qa	8m 54s
raspi-2-skia / raspi-2-skia_gold	8m 34s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / on-host-unit-test-report	2s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / on-host-unit-test-report	2s
	2h 7m 41s

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