testing: t.Parallel should pause test timer while it waits

[balasanjay]

The function t.Parallel() does not pause the internal timer, so the time that it takes
for the test case to get scheduled gets counted in that test's execution time. 

Options:
1) This can be fixed by moving the StopTimer stuff from testing.B to testing.common, and
using those functions inside t.Parallel to stop the timer before doing the chan ops, and
starting the timer again afterwards.

2) Manually pause and resume the timer by messing around with the start time in
t.Parallel

[balasanjay]

Comment 1:

I can write the fix, but I suspect it is too close to 1.1 to be accepted anyways. 
Either way, let me know which option is preferred so that when 1.1 is out, I can write
and send in a CR (if someone doesn't beat me to it).

[davecheney]

Comment 2:

I suggest this is a post 1.1 issue. IMO t.Parallel is not commonly used.

Labels changed: added priority-later, removed priority-triage.

Status changed to HelpWanted.

[rsc]

Comment 3:

Labels changed: added suggested, go1.2maybe.

Status changed to Accepted.

[robpike]

Comment 4:

Owner changed to @robpike.

Status changed to Started.

[robpike]

Comment 5:

This issue was closed by revision 6fb9cc1.

Status changed to Fixed.