cmd/go: add timing information to -debug-actiongraph · Issue #15736 · golang/go

In order to get insight into how cmd/go schedules work, I added the ability to generate a trace using the same viewer as cmd/trace. There is a screenshot and sample html output at #15734. It was generated using the command go build -a -trace std.html std. A partial implementation (doesn't trace downloads, test running, etc.) can be seen at unstable url. This issue is to discuss whether this would