Ensure that full-duplex audio test uses preferred buffer size.

Ensure that full-duplex audio test uses preferred buffer size.

The existing version does not work on Mac since it uses a hard coded buffer size and that is not allowed by the lower layers. 
The solution is to use the preferred buffer size instead.

BUG=none
TEST=media_unittests.exe --gtest_filter=AudioLow* --gtest_also_run_disabled_tests

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=166906

[henrika (OOO until Aug 14), 2012-11-09 13:06:40]

Please take a look Tommi.

[tommi (sloooow) - chröme, 2012-11-09 13:20:39]

lgtm with a couple of requests.

Can you please include the subject in the CL description as well?  When you
commit, I don't think that the subject will be included in the commit message
otherwise.

https://codereview.chromium.org/11360168/diff/3001/media/audio/audio_low_late...
File media/audio/audio_low_latency_input_output_unittest.cc (right):

https://codereview.chromium.org/11360168/diff/3001/media/audio/audio_low_late...
media/audio/audio_low_latency_input_output_unittest.cc:295: // Using same buffer
size as for the output side for now.
nit: move this line into the implementation since it doesn't make sense for the
caller to know this.

[henrika (OOO until Aug 14), 2012-11-09 13:30:57]

Done.

https://codereview.chromium.org/11360168/diff/3001/media/audio/audio_low_late...
File media/audio/audio_low_latency_input_output_unittest.cc (right):

https://codereview.chromium.org/11360168/diff/3001/media/audio/audio_low_late...
media/audio/audio_low_latency_input_output_unittest.cc:295: // Using same buffer
size as for the output side for now.
On 2012/11/09 13:20:39, tommi wrote:
> nit: move this line into the implementation since it doesn't make sense for
the
> caller to know this.

Done.