Lanai: Refactor RenderPerfTest to run single test by verbose name

RenderPerfTest supports running selected set of tests but you need to provide exact name of the method in the test. This name does not correspond to the names reported in the log. Here is the current output:

java -Dsun.java2d.metal=true -jar RenderPerfTest.jar testFlatBubbles
...
FlatOval : 51.42 FPS

We should change the test to use the same name in CLI and report