Add advice about Optional function arguments

Add advice about Optional function arguments

This comes from here:
https://codereview.webrtc.org/2585293002/diff/1/webrtc/modules/audio_coding/audio_network_adaptor/fec_controller.h#newcode91

BUG=none
NOTRY=true

Review-Url: https://codereview.webrtc.org/2624573004
Cr-Commit-Position: refs/heads/master@{#15980}
Committed: https://chromium.googlesource.com/external/webrtc/+/b3f7dbc7a5ce05f57958c23f4ca7fff09d24a66d

[kwiberg-webrtc, 2017-01-10 09:43:01]

kwiberg@webrtc.org changed reviewers:
+ henrik.lundin@webrtc.org, minyue@webrtc.org, ossu@webrtc.org

[hlundin-webrtc, 2017-01-10 09:55:25]

lgtm

[kwiberg-webrtc, 2017-01-10 10:09:16]

The CQ bit was checked by kwiberg@webrtc.org

[commit-bot: I haz the power, 2017-01-10 10:09:23]

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, 2017-01-10 10:11:18]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484042956222130, "parent_rev":
"ebfbc8ebfd0c9ace51353827a85fade550c04353", "commit_rev":
"b3f7dbc7a5ce05f57958c23f4ca7fff09d24a66d"}

[commit-bot: I haz the power, 2017-01-10 10:11:21]

Description was changed from

==========
Add advice about Optional function arguments

This comes from here:
https://codereview.webrtc.org/2585293002/diff/1/webrtc/modules/audio_coding/a...

BUG=none
NOTRY=true
==========

to

==========
Add advice about Optional function arguments

This comes from here:
https://codereview.webrtc.org/2585293002/diff/1/webrtc/modules/audio_coding/a...

BUG=none
NOTRY=true

Review-Url: https://codereview.webrtc.org/2624573004
Cr-Commit-Position: refs/heads/master@{#15980}
Committed:
https://chromium.googlesource.com/external/webrtc/+/b3f7dbc7a5ce05f57958c23f4...
==========

[commit-bot: I haz the power, 2017-01-10 10:11:21]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/b3f7dbc7a5ce05f57958c23f4...

[minyue-webrtc, 2017-01-10 10:39:23]

lgtm