don't hardcode jobs in fm_driver

This lets us pass a job on the command line,

    go run infra/bots/task_drivers/fm_driver/fm_driver.go out/fm tests b=cpu

or use -script to pass a file or stdin,

    cat << EOF | go run infra/bots/task_drivers/fm_driver/fm_driver.go -script - out/fm
    b=cpu tests
    gms skvm=false b=cpu w=$out/vanilla
    gms skvm=true  b=cpu w=$out/skvm
    #gms skvm=true  b=cpu w=$out/dp3      gamut=p3      tf=srgb
    #gms skvm=true  b=cpu w=$out/linear   gamut=srgb    tf=linear
    #gms skvm=true  b=cpu w=$out/rec2020  gamut=rec2020 tf=rec2020
    EOF

(This CL will make the one FM bot temporarily do nothing,
but the next CL should fix it.)

Change-Id: I1f3badac78a0f61698179c1afec37b3020539fff
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/362216
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
3 files changed