Wait for the renderer even on WASAPI.

Wait for the renderer even on WASAPI.

After weeks of investigation, Henrik has been unable find a WASAPI
buffer size that works for all users.  Many users are still reporting
glitches.  Thus its time to put the WaitTillDataReady() back. :(

BUG=171651
TEST=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=185650

[DaleCurtis, 2013-03-01 22:18:59]

This is a tiny, M26 (perhaps even M25) mergeable version of a patch I'll make
for removing WaitTillDataReady() from AudioSourceCallback and
AudioOutputController in favor of a private method in AudioSyncReader.

Henrika asked me to put this together for him since he's out of office today. 
He's at the end of his rope for native improvements :(

[scherkus (not reviewing), 2013-03-01 23:51:40]

lgtm

[commit-bot: I haz the power, 2013-03-01 23:58:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dalecurtis@chromium.org/12380074/1

[DaleCurtis, 2013-03-02 01:38:41]

Committed patchset #2 manually as r185650 (presubmit successful).

[henrika (OOO until Aug 14), 2013-03-06 07:44:58]

Dale, thanks for merging.