Perf bots for https://codereview.chromium.org/2473743003

Perf bots for https://codereview.chromium.org/2473743003

patch from issue 2611613004 at patchset 1 (http://crrev.com/2611613004#ps1)

[nainar, 2017-02-21 02:59:01]

Ran the following command:
tools/perf/run_benchmark try all-android memory.top_10_mobile 

The perf console has changed but on the face of things this patch even though
reading from the HashMap a lot more often doesn't seem to have affected memory. 

Running perf tests next.

[nainar, 2017-02-21 04:57:23]

On 2017/02/21 at 02:59:01, nainar wrote:
> Ran the following command:
> tools/perf/run_benchmark try all-android memory.top_10_mobile 
> 
> The perf console has changed but on the face of things this patch even though
reading from the HashMap a lot more often doesn't seem to have affected memory. 
> 
> Running perf tests next.

Ran perf tests as well as can be seen above and there has been some improvement
due to the patch. (<1% in update_style and <2% in update_style_cold) So I don't
see any perf problems with landing this patch even with a few changes.