Cherry pick PR #1832: Add test cases for cobalt::loader::FetcherCache #1986

Job	Run time
raspi-2 / initialize	34s
raspi-2-skia / initialize	32s
raspi-2-skia / docker-build-image	29s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	29s
raspi-2 / docker-unittest-image	0s
raspi-2 / raspi_devel	9m 6s
raspi-2 / raspi_debug	13m 37s
raspi-2 / raspi_qa	7m 29s
raspi-2 / raspi_gold	7m 31s
raspi-2 / sbversion-15_devel	9m 10s
raspi-2 / sbversion-15_debug	14m 20s
raspi-2 / sbversion-15_qa	7m 27s
raspi-2 / sbversion-15_gold	8m 9s
raspi-2-skia / raspi-2-skia_devel	9m 58s
raspi-2-skia / raspi-2-skia_debug	12m 34s
raspi-2-skia / raspi-2-skia_qa	7m 25s
raspi-2-skia / raspi-2-skia_gold	7m 33s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	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 56m 23s

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