Add tiny strings test case to ScannerBenchmark.

Split short(1-50 chars) into tiny(1-5) and short(10-50 chars).

Bug: 192640751
Test: vogar --mode device --benchmark \
libcore/benchmarks/src/benchmarks/regression/ScannerBenchmark.java

Change-Id: Iac95a1c98c0db6a8ddea2f22d90e77eb7a7644bb
1 file changed