Enable higher latency audio on Windows for basic playback.

Enable higher latency audio on Windows for basic playback.

This does not change the WASAPI callback frequency, just the amount
of data that gets buffered on the browser side.

Sadly the WASAPI callback frequency is fixed irrespective of the
buffer size we specify, so the best we can do is reduce the number
of IPC round trips.

The net effect of this change is that the renderer side sends larger
chunks to the browser which are FIFO'd by AudioOutputResampler to the
output buffer size desired by WASAPI.

Having more data on the browser side should help reduce glitching
when the system is under load.

With this change all platforms have a high latency buffer size
implementation, so some #define gunk can be removed too.

BUG=362261, 362294
TEST=FIFO is created on the browser side.  Audio sounds fine.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=270519

[henrika (OOO until Aug 14), 2014-05-14 10:45:33]

Looks good Dale. I think it will work well but do you plan to follow up by
making new measurements at high load when this has landed? Not sure if "low
power" actually is a valid title.

LGTM

[DaleCurtis, 2014-05-14 17:27:25]

Fixed the title to remove "lower power."  Thanks for review!

[DaleCurtis, 2014-05-14 17:27:45]

Oh, and yes, I will do some measurements on my home machine to see if this makes
things better.

[DaleCurtis, 2014-05-14 17:27:50]

The CQ bit was checked by dalecurtis@chromium.org

[commit-bot: I haz the power, 2014-05-14 17:28:28]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dalecurtis@chromium.org/275943003/60001

[commit-bot: I haz the power, 2014-05-14 20:18:21]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  ios_dbg_simulator on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_dbg_simulator/bui...)
  linux_chromium_chromeos_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)
  linux_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_rel/bu...)
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-05-14 20:21:48]

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

[commit-bot: I haz the power, 2014-05-14 20:21:48]

Try jobs failed on following builders:
  ios_dbg_simulator on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_dbg_simulator/bui...)

[DaleCurtis, 2014-05-14 23:05:46]

The CQ bit was checked by dalecurtis@chromium.org

[commit-bot: I haz the power, 2014-05-14 23:07:23]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dalecurtis@chromium.org/275943003/60001

[commit-bot: I haz the power, 2014-05-15 00:02:02]

Change committed as 270519