Reland of actor NACK bitrate allocation

Reland of actor NACK bitrate allocation (patchset #1 id:1 of https://codereview.webrtc.org/2131913003/ )

Reason for revert:
Upstream fixes in place, should be OK now.

Original issue's description:
> Revert of Refactor NACK bitrate allocation (patchset #16 id:300001 of https://codereview.webrtc.org/2061423003/ )
>
> Reason for revert:
> Breaks upstream code.
>
> Original issue's description:
> > Refactor NACK bitrate allocation
> >
> > Nack bitrate allocation should not be done on a per-rtp-module basis,
> > but rather shared bitrate pool per call. This CL moves allocation to the
> > pacer and cleans up a bunch if bitrate stats handling.
> >
> > BUG=
> > R=danilchap@webrtc.org, stefan@webrtc.org, tommi@webrtc.org
> >
> > Committed: https://chromium.googlesource.com/external/webrtc/+/5fc59e810b8ea848702f2dbc740fe190608e1413
>
> TBR=tommi@webrtc.org,danilchap@webrtc.org,stefan@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=
>
> Committed: https://crrev.com/e5dd44101eca485f5ad12e5f7ce6f6b0d204116b
> Cr-Commit-Position: refs/heads/master@{#13417}

TBR=tommi@webrtc.org,danilchap@webrtc.org,stefan@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Committed: https://crrev.com/cd349d97433636a26df087058a11770ed018a85c
Cr-Commit-Position: refs/heads/master@{#13465}

[sprang_webrtc, 2016-07-13 15:36:19]

The CQ bit was checked by sprang@webrtc.org

[sprang_webrtc, 2016-07-13 15:36:20]

Created Reland of actor NACK bitrate allocation

[commit-bot: I haz the power, 2016-07-13 15:36:34]

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, 2016-07-13 16:11:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-13 16:11:44]

Description was changed from

==========
Reland of actor NACK bitrate allocation (patchset #1 id:1 of
https://codereview.webrtc.org/2131913003/ )

Reason for revert:
Upstream fixes in place, should be OK now.

Original issue's description:
> Revert of Refactor NACK bitrate allocation (patchset #16 id:300001 of
https://codereview.webrtc.org/2061423003/ )
> 
> Reason for revert:
> Breaks upstream code.
> 
> Original issue's description:
> > Refactor NACK bitrate allocation
> >
> > Nack bitrate allocation should not be done on a per-rtp-module basis,
> > but rather shared bitrate pool per call. This CL moves allocation to the
> > pacer and cleans up a bunch if bitrate stats handling.
> >
> > BUG=
> > R=danilchap@webrtc.org, stefan@webrtc.org, tommi@webrtc.org
> >
> > Committed:
https://chromium.googlesource.com/external/webrtc/+/5fc59e810b8ea848702f2dbc7...
> 
> TBR=tommi@webrtc.org,danilchap@webrtc.org,stefan@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=
> 
> Committed: https://crrev.com/e5dd44101eca485f5ad12e5f7ce6f6b0d204116b
> Cr-Commit-Position: refs/heads/master@{#13417}

TBR=tommi@webrtc.org,danilchap@webrtc.org,stefan@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=
==========

to

==========
Reland of actor NACK bitrate allocation (patchset #1 id:1 of
https://codereview.webrtc.org/2131913003/ )

Reason for revert:
Upstream fixes in place, should be OK now.

Original issue's description:
> Revert of Refactor NACK bitrate allocation (patchset #16 id:300001 of
https://codereview.webrtc.org/2061423003/ )
>
> Reason for revert:
> Breaks upstream code.
>
> Original issue's description:
> > Refactor NACK bitrate allocation
> >
> > Nack bitrate allocation should not be done on a per-rtp-module basis,
> > but rather shared bitrate pool per call. This CL moves allocation to the
> > pacer and cleans up a bunch if bitrate stats handling.
> >
> > BUG=
> > R=danilchap@webrtc.org, stefan@webrtc.org, tommi@webrtc.org
> >
> > Committed:
https://chromium.googlesource.com/external/webrtc/+/5fc59e810b8ea848702f2dbc7...
>
> TBR=tommi@webrtc.org,danilchap@webrtc.org,stefan@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=
>
> Committed: https://crrev.com/e5dd44101eca485f5ad12e5f7ce6f6b0d204116b
> Cr-Commit-Position: refs/heads/master@{#13417}

TBR=tommi@webrtc.org,danilchap@webrtc.org,stefan@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Committed: https://crrev.com/cd349d97433636a26df087058a11770ed018a85c
Cr-Commit-Position: refs/heads/master@{#13465}
==========

[commit-bot: I haz the power, 2016-07-13 16:11:46]

Patchset 1 (id:??) landed as
https://crrev.com/cd349d97433636a26df087058a11770ed018a85c
Cr-Commit-Position: refs/heads/master@{#13465}