CL reduces BenchmarkState to minimal levels. It also adds
a warmup loop to get things going first before starting measurements.
With this change with clocks /not/ locked on bullhead the test for
RenderNodeJniOverhead is showing a stable (0ns std dev) result
of 54ns, which is approximately the expected amount.
Test: Ran a few perf benchmarks
Change-Id: If01e455884711ebd9cfb89f076efa19dc0b5436d
Merge core, graphics, and misc into one
test suite as the split is unneccessary.
Also cleans up package names
Change-Id: I82da6cd69b3a52c63770465780ac98628af334ca
