Add Scanner benchmark.

Simple benchmark which just reads all the available data.

aosp/1741173 should be applied first. vogar won't run without it.
On S device `ln -s /apex/com.android.art/bin/dalvikvm /system/bin/dalvikvm`
should be run first.

Bug: 192640751
Test: vogar --mode device --benchmark \

libcore/benchmarks/src/benchmarks/regression/ScannerReadFileBenchmark.java

Change-Id: I7bae22fcc7bdee71dd141958d261e59ee60273f5
1 file changed