Update average times for perf desktop benchmarks

Update average times for perf desktop benchmarks

BUG=687425

[sullivan, 2017-02-01 15:41:54]

sullivan@chromium.org changed reviewers:
+ sullivan@chromium.org

[sullivan, 2017-02-01 15:41:54]

lgtm

The intent of this CL lgtm.

It's really hard to actually get a diff of the JSON to verify that the times
seem sane, there's no stray commas, etc. Is this covered by some kind of tests
(for example, would it submit if the json was invalid?)

[martiniss, 2017-02-02 19:21:21]

On 2017/02/01 at 15:41:54, sullivan wrote:
> lgtm
> 
> The intent of this CL lgtm.
> 
> It's really hard to actually get a diff of the JSON to verify that the times
seem sane, there's no stray commas, etc. Is this covered by some kind of tests
(for example, would it submit if the json was invalid?)

I'm holding off on submitting this CL until I can generate some kind of diff,
since I am also worried about this possibility. I also want to be able to put
some sort of info in the description about what the affected benchmarks will be.