Output calmbench json in nanobench format

Meanwhile, we also make the bot name more similar to the perf bot.

Bug: skia:
Change-Id: I8b0e6aa2d927aa4a0ce57606345589adb6e920b3
Reviewed-on: https://skia-review.googlesource.com/64082
Reviewed-by: Eric Boren <borenet@google.com>
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
12 files changed