[LNT] Make baseline colour closer to the sample than its neighbour

[Chris Matthews]

LGTM.

> On Jul 1, 2014, at 9:51 AM, Yi Kong <kongy.dev at gmail.com> wrote:
> 
> Hi Chris,
> 
> Baseline plot is currently quite confusing. Second baseline and those
> after has color is irrelevant to the sample it's comparing to. The
> patch should make them more distinguishable by setting baseline colour
> closer to the sample than its neighbour.
> 
> For comparison:
> http://llvm.org/perf/db_default/v4/nts/graph?plot.426=34.426.2&plot.412=34.412.2&plot.214=34.214.2&baseline.b=19898&baseline.b2=19899
> 
> http://noncsg.doc.ic.ac.uk:55088/db_default/v4/nts/graph?plot.169=3.169.3&plot.170=3.170.3&plot.171=3.171.3&baseline.b=19&baseline.b2=21
> 
> -Yi
> <lnt.diff>