Fixes #357: broken RMS values when time unit is set.
Fixes #357: broken RMS values when time unit is set.

codygray/benchmark,disconnect3d/benchmark,efcs/benchmark,everbase/benchmark,everbase/benchmark,disconnect3d/benchmark,google/benchmark,mockingbirdnest/benchmark,codygray/benchmark,codygray/benchmark,mockingbirdnest/benchmark,disconnect3d/benchmark,efcs/benchmark,everbase/benchmark,efcs/benchmark,codygray/benchmark,disconnect3d/benchmark,efcs/benchmark,google/benchmark,mockingbirdnest/benchmark,everbase/benchmark,google/benchmark,mockingbirdnest/benchmark