This is to make sure the Chrome benchmarks reset program won't disrupt cros team's continuous integration.

Since two benchmarks can't co exist with same name in tools/perf/ directory, I suggest name the copy benchmarks with ".cros" suffix. This mean in the short term, you can run both "benchmark_foo.bar" & "benchmark_foo.bar.cros". Once your test infra switch to use "benchmark_foo.bar.cros" version, we removing "benchmark_foo.bar" won't affect you.