Cherry pick PR #1983: Add CHECK for cobalt::loader::FetcherCache #1351

Job	Run time
raspi-2 / initialize	33s
raspi-2-skia / initialize	35s
raspi-2 / docker-build-image	33s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	35s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / raspi_devel	7m 7s
raspi-2 / raspi_debug	10m 54s
raspi-2 / raspi_qa	7m 28s
raspi-2 / raspi_gold	6m 56s
raspi-2 / sbversion-15_devel	7m 10s
raspi-2 / sbversion-15_debug	11m 12s
raspi-2 / sbversion-15_qa	7m 49s
raspi-2 / sbversion-15_gold	8m 0s
raspi-2-skia / raspi-2-skia_devel	7m 40s
raspi-2-skia / raspi-2-skia_debug	10m 59s
raspi-2-skia / raspi-2-skia_qa	7m 7s
raspi-2-skia / raspi-2-skia_gold	6m 32s
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
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
	1h 41m 10s

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