Cherry pick PR #2808: Possibly avoid ANRs during MediaSession updates and actions. #1924

Job	Run time
raspi-2-skia / initialize	44s
raspi-2 / initialize	31s
raspi-2 / docker-build-image	32s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	28s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / raspi_devel	8m 18s
raspi-2 / raspi_debug	12m 34s
raspi-2 / raspi_qa	6m 50s
raspi-2 / raspi_gold	7m 19s
raspi-2 / sbversion-15_devel	9m 3s
raspi-2 / sbversion-15_debug	11m 57s
raspi-2 / sbversion-15_qa	8m 14s
raspi-2 / sbversion-15_gold	7m 5s
raspi-2-skia / raspi-2-skia_devel	8m 15s
raspi-2-skia / raspi-2-skia_debug	11m 47s
raspi-2-skia / raspi-2-skia_qa	7m 23s
raspi-2-skia / raspi-2-skia_gold	7m 22s
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	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / on-host-unit-test-report	0s
	1h 48m 22s

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