Add screenshare perf tests with lossy links

Add screenshare perf tests with lossy links

This is a re-land of https://codereview.webrtc.org/1409513005/
Fingers crossed, the problems previously seen have been resolved by
https://codereview.webrtc.org/1412233003/

BUG=

Committed: https://crrev.com/ee37de3c13c5fe4b397d909918e9f980dc8184c5
Cr-Commit-Position: refs/heads/master@{#10751}

[sprang_webrtc, 2015-11-12 15:36:09]

sprang@webrtc.org changed reviewers:
+ pbos@webrtc.org

[pbos-webrtc, 2015-11-12 15:38:43]

here's hoping! lgtm

[sprang_webrtc, 2015-11-16 09:50:55]

The CQ bit was checked by sprang@webrtc.org

[commit-bot: I haz the power, 2015-11-16 09:51:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1409993011/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1409993011/1

[commit-bot: I haz the power, 2015-11-16 09:52:13]

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

[commit-bot: I haz the power, 2015-11-16 09:52:15]

Try jobs failed on following builders:
  ios32_sim_dbg on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/ios32_sim_dbg/builds/3304)
  ios_dbg on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/ios_dbg/builds/10759)
  ios_rel on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/ios_rel/builds/9397)
  linux_asan on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/linux_asan/builds/10625)
  linux_rel on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/linux_rel/builds/10787)
  mac_compile_dbg on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/mac_compile_dbg/builds/...)
  mac_compile_x64_dbg on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/mac_compile_x64_dbg/bui...)
  mac_x64_gn_dbg on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/mac_x64_gn_dbg/builds/5267)
  mac_x64_rel on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/mac_x64_rel/builds/10487)

[sprang_webrtc, 2015-11-23 13:15:59]

The CQ bit was checked by sprang@webrtc.org

[sprang_webrtc, 2015-11-23 13:15:59]

The patchset sent to the CQ was uploaded after l-g-t-m from pbos@webrtc.org
Link to the patchset: https://codereview.webrtc.org/1409993011/#ps20001 (title:
"Rebase")

[commit-bot: I haz the power, 2015-11-23 13:16:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1409993011/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1409993011/20001

[commit-bot: I haz the power, 2015-11-23 14:10:27]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-23 14:10:33]

Patchset 2 (id:??) landed as
https://crrev.com/ee37de3c13c5fe4b397d909918e9f980dc8184c5
Cr-Commit-Position: refs/heads/master@{#10751}