This permits full URLs to be shown on the dashboard,
not just the repository roots.
This has been tested.
R=rsc, mattn.jp
CC=golang-dev
https://golang.org/cl/4627081
Will fill dashboard down the screen instead of up
when builders get stuck and resume. Already live.
Also delete dead benchmark code.
I think it is safe to say that if/when we bring
benchmarks back, we will use a different
data model.
Fixes#1228.
R=adg
CC=golang-dev
https://golang.org/cl/4449059