Fix stats for encoder target bitrate when target rate is zero.

Fix stats for encoder target bitrate when target rate is zero.
When the target bitrate is zero, currently  VideoSendStream.Stats.target_media_bitrate_bps show the last set rate before the target was set to zero.

BUG=webrtc::5687 b/29574845

Committed: https://crrev.com/f5b2e519b4067e209d2cebbd4b1ef485d2a5c289
Cr-Commit-Position: refs/heads/master@{#13386}

[perkj_webrtc, 2016-07-05 09:11:44]

perkj@webrtc.org changed reviewers:
+ stefan@webrtc.org

[perkj_webrtc, 2016-07-05 09:11:44]

Can you please review?

[stefan-webrtc, 2016-07-05 09:26:08]

lgtm

[perkj_webrtc, 2016-07-05 09:49:58]

The CQ bit was checked by perkj@webrtc.org

[commit-bot: I haz the power, 2016-07-05 09:50:10]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-07-05 11:50:45]

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

[commit-bot: I haz the power, 2016-07-05 11:50:46]

Try jobs failed on following builders:
  android_arm64_rel on master.tryserver.webrtc (JOB_TIMED_OUT, no build URL)
  android_dbg on master.tryserver.webrtc (JOB_TIMED_OUT, no build URL)

[perkj_webrtc, 2016-07-05 15:32:22]

The CQ bit was checked by perkj@webrtc.org

[commit-bot: I haz the power, 2016-07-05 15:32:24]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-07-05 15:34:07]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-05 15:34:09]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-05 15:34:12]

Description was changed from

==========
Fix stats for encoder target bitrate when target rate is zero.
When the target bitrate is zero, currently 
VideoSendStream.Stats.target_media_bitrate_bps show the last set rate before the
target was set to zero.


BUG=webrtc::5687 b/29574845
==========

to

==========
Fix stats for encoder target bitrate when target rate is zero.
When the target bitrate is zero, currently 
VideoSendStream.Stats.target_media_bitrate_bps show the last set rate before the
target was set to zero.

BUG=webrtc::5687 b/29574845

Committed: https://crrev.com/f5b2e519b4067e209d2cebbd4b1ef485d2a5c289
Cr-Commit-Position: refs/heads/master@{#13386}
==========

[commit-bot: I haz the power, 2016-07-05 15:34:13]

Patchset 2 (id:??) landed as
https://crrev.com/f5b2e519b4067e209d2cebbd4b1ef485d2a5c289
Cr-Commit-Position: refs/heads/master@{#13386}