testing: use time.Since in highPrecisionTime

time.Since has optimizations for measuring monotonic time.

For #31160.

Change-Id: I0529b9f69b9f008e3414b8e386b6faa64af4a008
Reviewed-on: https://go-review.googlesource.com/c/go/+/582135
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

diff --git a/src/testing/testing_other.go b/src/testing/testing_other.go
index 586f61b0ce85d282238443f9b018ef4f1c77e195..f91e3b4a2c29055047244016432e3a5fd42fbdc8 100644 (file)
--- a/src/testing/testing_other.go
+++ b/src/testing/testing_other.go
@@ -27,5 +27,5 @@ func highPrecisionTimeNow() highPrecisionTime {
 
 // highPrecisionTimeSince returns duration since b.
 func highPrecisionTimeSince(b highPrecisionTime) time.Duration {
-       return time.Now().Sub(b.now)
+       return time.Since(b.now)
 }