Add --properties for things like gitHash that describe the current nanobench run.

Add --properties for things like gitHash that describe the current nanobench run.

--key describes the type of run (describes the line on the chart), --properties
describes the run itself (describes the dot on the chart).

We'll pass --properties gitHash <git hash> build_number <build number>  --key
... to nanobench from the bots.


And... delete a whole lot of dead code.


Example: nanobench --properties gitHash foo build_number 1234 --key bar baz 

{
   "build_number" : "1234",
   "gitHash" : "foo",
   "key" : {
      "bar" : "baz"
   },
   "results" : {
....

Friends with https://codereview.chromium.org/491943002
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/1915b62637bea20e1471a8a358b22e9e47a4a385

[jcgregorio, 2014-08-20 18:35:52]

On 2014/08/20 18:22:50, mtklein wrote:

LGTM

Gotta love deleting that much code!

[mtklein, 2014-08-20 18:38:09]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-08-20 18:38:26]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/488213002/2

[commit-bot: I haz the power, 2014-08-20 18:45:09]

Committed patchset #2 (2) as 1915b62637bea20e1471a8a358b22e9e47a4a385