Cherry pick PR #3096: Deprecate SbThreadLocalKey #94

Job	Run time
raspi-2 / initialize	43s
raspi-2-skia / initialize	45s
raspi-2 / docker-build-image	1m 13s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	1m 10s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / raspi_devel	5m 25s
raspi-2 / raspi_debug	5m 24s
raspi-2 / raspi_qa	4m 54s
raspi-2 / raspi_gold	4m 58s
raspi-2 / sbversion-15_devel	5m 45s
raspi-2 / sbversion-15_debug	5m 20s
raspi-2 / sbversion-15_qa	5m 9s
raspi-2 / sbversion-15_gold	4m 58s
raspi-2-skia / raspi-2-skia_devel	5m 47s
raspi-2-skia / raspi-2-skia_debug	5m 17s
raspi-2-skia / raspi-2-skia_qa	5m 7s
raspi-2-skia / raspi-2-skia_gold	4m 59s
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
	1h 6m 54s

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