Add histograms for WebRTC estimated bitrate and pacer bitrate.

Add histograms for WebRTC estimated bitrate and pacer bitrate.

Metrics added to WebRTC here: https://chromium.googlesource.com/external/webrtc/+/18adf0a79d4a0ea124c7f27fd553382d0b0cb7ac

Committed: https://crrev.com/79e75dc188e82f80fbf053694ccf4a0d2ef5ef4b
Cr-Commit-Position: refs/heads/master@{#361277}

[Stefan, 2015-11-23 13:22:41]

holmer@chromium.org changed reviewers:
+ asvitkine@chromium.org

[Alexei Svitkine (slow), 2015-11-23 16:17:20]

LGTM

Please modify the CL description to link to the CL that added these metrics.

[Stefan, 2015-11-23 16:18:54]

Description was changed from

==========
Add histograms for WebRTC estimated bitrate and pacer bitrate.
==========

to

==========
Add histograms for WebRTC estimated bitrate and pacer bitrate.

Metrics added to WebRTC here:
https://chromium.googlesource.com/external/webrtc/+/18adf0a79d4a0ea124c7f27fd...
==========

[Stefan, 2015-11-23 16:18:58]

The CQ bit was checked by holmer@chromium.org

[commit-bot: I haz the power, 2015-11-23 16:20:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1467233002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1467233002/1

[commit-bot: I haz the power, 2015-11-23 17:35:25]

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

[commit-bot: I haz the power, 2015-11-23 17:35:25]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Stefan, 2015-11-24 07:21:13]

The CQ bit was checked by holmer@chromium.org

[commit-bot: I haz the power, 2015-11-24 07:22:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1467233002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1467233002/1

[commit-bot: I haz the power, 2015-11-24 07:50:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-24 07:51:39]

Patchset 1 (id:??) landed as
https://crrev.com/79e75dc188e82f80fbf053694ccf4a0d2ef5ef4b
Cr-Commit-Position: refs/heads/master@{#361277}