Use the optimal buffer size for the local audio renderer.

Use the optimal buffer size for the local audio renderer.

The issue is that the WebRtcLocalAudioRenderer is using 128 samples as buffer size on Mac, which can screw up the CoreAudio. And it makes perfect sense to use the same buffer size to render both the local and remote audio stream.
And we have the same issue on Linux as well.

This patch fix the problem on all platforms.

BUG=412765, 410258
Committed: https://crrev.com/45bd4345afae9ec2a8676b0a13c9dfbf58f8c32d
Cr-Commit-Position: refs/heads/master@{#300700}

[no longer working on chromium, 2014-10-22 14:09:03]

xians@chromium.org changed reviewers:
+ henrika@chromium.org

[no longer working on chromium, 2014-10-22 14:09:52]

Henrik, could you please review?

Thanks,
SX

[henrika (OOO until Aug 14), 2014-10-22 14:14:34]

LGTM

[no longer working on chromium, 2014-10-22 14:15:31]

The CQ bit was checked by xians@chromium.org

[commit-bot: I haz the power, 2014-10-22 14:16:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/646033007/1

[commit-bot: I haz the power, 2014-10-22 17:56:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-22 17:57:28]

Patchset 1 (id:??) landed as
https://crrev.com/45bd4345afae9ec2a8676b0a13c9dfbf58f8c32d
Cr-Commit-Position: refs/heads/master@{#300700}

[DaleCurtis, 2014-10-22 18:04:56]

dalecurtis@chromium.org changed reviewers:
+ dalecurtis@chromium.org

[DaleCurtis, 2014-10-22 18:04:56]

Does this resolve the Hangouts issue discussed on
https://codereview.chromium.org/661443002/ ?

[no longer working on chromium, 2014-10-23 21:04:39]

On 2014/10/22 18:04:56, DaleCurtis wrote:
> Does this resolve the Hangouts issue discussed on
> https://codereview.chromium.org/661443002/ ?

No, this only affects the use case when a local media stream (capture stream) is
rendered to speaker, since hangout does not render a local media stream, so it
doesn't affect hangout at all.
The hangout issue is related to WebAudio stream, I will soon make a CL to change
the default buffer size from 128 to 256.