Add basic microbenchmarks for algorithm #27403

Job	Run time
build-cfg	1s
android-test-gmd-cfg	1s
android-test-gmd-cfg-check	1s
build-cfg-check	1s
android-test-gmd (23, aosp, nexus4)	31m 43s
android-test-gmd (30, wear, wearoslargeround)	22m 35s
android-test-gmd (34, aosp, pixel2)	36m 20s
build (21)	21m 31s
build (35)	23m 15s
codecov-unit-test-upload (21)	10s
codecov-unit-coverage-upload (21)	7s
codecov-unit-test-upload (35)	7s
codecov-unit-coverage-upload (35)	3s
codecov-device-test-upload (23, aosp, nexus4)	4s
codecov-device-test-upload (34, aosp, pixel2)	4s
codecov-device-coverage-upload	0s
codecov-device-test-upload (30, wear, wearoslargeround)	6s
	2h 16m 9s

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