exp/cmd/camserver: add framesPerSecond constant, increase to 30fps
exp/cmd/camserver: add framesPerSecond constant, increase to 30fps

Change-Id: I0eb755d4c93e91ee480ed57c92f6f2ad85a275bc
Reviewed-on: https://upspin-review.googlesource.com/9827
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

upspin/exp,upspin/exp