metrics: move `sum` up to interface `Metric`
authorAlexandre Terrasa <alexandre@moz-code.org>
Thu, 23 Apr 2015 18:58:11 +0000 (14:58 -0400)
committerAlexandre Terrasa <alexandre@moz-code.org>
Thu, 23 Apr 2015 19:13:52 +0000 (15:13 -0400)
Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>


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