Reland of [Pywebsocket PerformanceTests 2/2] Add blink_perf.pywebsocket

Reland of [Pywebsocket PerformanceTests 2/2] Add blink_perf.pywebsocket
(patchset #17 id:500001 of https://codereview.chromium.org/736653002/ )

The original CL is reverted (https://codereview.chromium.org/1333153002/):
> Reason for revert:
> New test on the reference build causing Linux and Mac perf bots to fail.
> http://crbug.com/530374

This relanding CL disables blink_perf.pywebsocket tests on reference builds
because some tests require Chromium 42, which is newer than reference builds.

> This CL adds blink_perf.pywebsocket, in which
> - Pywebsocket server is started at localhost:8001, and
> - Browser option --disable-web-security is added,
>       because we need cross-origin accesses between
>       memory_cache_http_server and pywebsocket server.
>
> [1/2] PerformanceTests scripts: https://codereview.chromium.org/738753002/
> [2/2] Telemetry: This CL

BUG=432408, 530374
TBR=nednguyen@google.com

CQ_EXTRA_TRYBOTS=tryserver.chromium.perf:linux_perf_bisect;tryserver.chromium.perf:mac_perf_bisect;tryserver.chromium.perf:win_perf_bisect

Committed: https://crrev.com/4df951a439d8a09158a1405cad48cf6423d7feb8
Cr-Commit-Position: refs/heads/master@{#348357}

[hiroshige, 2015-09-11 04:22:16]

hiroshige@chromium.org changed reviewers:
+ nednguyen@google.com

[hiroshige, 2015-09-11 04:22:22]

The CQ bit was checked by hiroshige@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-11 04:22:26]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1331403002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1331403002/20001

[hiroshige, 2015-09-11 05:19:07]

The CQ bit was unchecked by hiroshige@chromium.org

[hiroshige, 2015-09-11 05:19:21]

The CQ bit was checked by hiroshige@chromium.org

[commit-bot: I haz the power, 2015-09-11 05:19:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1331403002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1331403002/20001

[commit-bot: I haz the power, 2015-09-11 06:55:51]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-11 06:55:51]

Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[hiroshige, 2015-09-11 07:08:34]

The CQ bit was checked by hiroshige@chromium.org

[commit-bot: I haz the power, 2015-09-11 07:08:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1331403002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1331403002/20001

[commit-bot: I haz the power, 2015-09-11 07:53:44]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-11 07:54:20]

Patchset 2 (id:??) landed as
https://crrev.com/4df951a439d8a09158a1405cad48cf6423d7feb8
Cr-Commit-Position: refs/heads/master@{#348357}

[commit-bot: I haz the power, 2015-09-23 12:20:20]

Patchset 2 (id:??) landed as
https://crrev.com/4df951a439d8a09158a1405cad48cf6423d7feb8
Cr-Commit-Position: refs/heads/master@{#348357}