GitLab

Bring back the OpenJDK implementation but make sure that it's
case sensitive in its matching.

Also update JarFile benchmark to use a different set of JarFiles
(ones that actually have resources and are signed).

AFTER:

Experiment {instrument=runtime, benchmarkMethod=time, vm=default, parameters={filename=/system/framework/core-oj.jar}}
    runtime(ns): min=89200.91, 1st qu.=92035.88, median=96248.38, mean=95636.11, 3rd qu.=97204.71, max=104263.73
Experiment {instrument=runtime, benchmarkMethod=time, vm=default, parameters={filename=/system/priv-app/Phonesky/Phonesky.apk}}
    runtime(ns): min=32815012.40, 1st qu.=33074432.68, median=34521206.63, mean=34974008.88, 3rd qu.=36545497.61, max=39179367.36

BEFORE:
Experiment {instrument=runtime, benchmarkMethod=time, vm=default, parameters={filename=/system/framework/core-oj.jar}}
    runtime(ns): min=317222.97, 1st qu.=333416.42, median=339164.45, mean=344867.65, 3rd qu.=352596.11, max=392011.29
Experiment {instrument=runtime, benchmarkMethod=time, vm=default, parameters={filename=/system/priv-app/Phonesky/Phonesky.apk}}
    runtime(ns): min=36966924.00, 1st qu.=39058659.29, median=43041285.43, mean=42476010.68, 3rd qu.=45566839.83, max=46848927.18

This isn't a perfect benchmark, because a lot of time is spent constructing the JarFile each time.
However, we've shaved times by a third for files with a "reasonable"
number of entries.

bug: 28713954

Change-Id: Ic0de000be683dc8009818930658ae4a443d81559