Keep lock after updating encoder parameters.

Keep lock after updating encoder parameters.

Additionally adds some thread annotations.

BUG=
R=stefan@webrtc.org

Committed: https://crrev.com/dcb89988216916aebd479aec20798868ea093716
Cr-Commit-Position: refs/heads/master@{#9941}

[pbos-webrtc, 2015-09-15 09:37:14]

hola~

[stefan-webrtc, 2015-09-15 09:41:48]

lgtm

[pbos-webrtc, 2015-09-15 09:50:27]

void -> Set..

[pbos-webrtc, 2015-09-15 09:50:34]

The CQ bit was checked by pbos@webrtc.org

[pbos-webrtc, 2015-09-15 09:50:34]

The patchset sent to the CQ was uploaded after l-g-t-m from stefan@webrtc.org
Link to the patchset: https://codereview.webrtc.org/1336023004/#ps20001 (title:
"void -> Set..")

[commit-bot: I haz the power, 2015-09-15 09:50:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1336023004/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1336023004/20001

[commit-bot: I haz the power, 2015-09-15 11:50:55]

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

[commit-bot: I haz the power, 2015-09-15 11:50:56]

Try jobs failed on following builders:
  android on tryserver.webrtc (JOB_TIMED_OUT, no build URL)
  win_baremetal on tryserver.webrtc (JOB_TIMED_OUT, no build URL)

[pbos-webrtc, 2015-09-15 12:23:47]

The CQ bit was checked by pbos@webrtc.org

[commit-bot: I haz the power, 2015-09-15 12:23:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1336023004/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1336023004/20001

[pbos-webrtc, 2015-09-15 12:44:02]

Committed patchset #2 (id:20001) manually as
dcb89988216916aebd479aec20798868ea093716 (presubmit successful).

[commit-bot: I haz the power, 2015-09-15 12:44:05]

Patchset 2 (id:??) landed as
https://crrev.com/dcb89988216916aebd479aec20798868ea093716
Cr-Commit-Position: refs/heads/master@{#9941}