Use O_NONBLOCK when opening audio pipe on linux.

Use O_NONBLOCK when opening audio pipe on linux.

By default open() blocks when opening a fifo until the writer also
opens the fifo. In the past AudioPipeReader was using O_NONBLOCK
when opening the pipe for reading, but that was changed in r277315,
and may result in host hanging if pulseaudio doesn't open the pipe
for some reason. Fixed AudioPipeReader to always pass O_NONBLOCK
to open().

BUG=420090
R=lambroslambrou@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/2456707799f5ee29ccd0ccf7ba530d205115803c

[Sergey Ulanov, 2014-12-23 23:39:36]

Patchset #1 (id:1) has been deleted

[Sergey Ulanov, 2014-12-23 23:39:57]

sergeyu@chromium.org changed reviewers:
+ lambroslambrou@chromium.org

[Lambros, 2014-12-23 23:58:05]

lgtm

[Sergey Ulanov, 2014-12-24 00:02:29]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2014-12-24 00:03:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/820123002/20001

[commit-bot: I haz the power, 2014-12-24 00:11:38]

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

[commit-bot: I haz the power, 2014-12-24 00:11:39]

Try jobs failed on following builders:
  android_chromium_gn_compile_dbg on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

[commit-bot: I haz the power, 2014-12-24 00:38:37]

Patchset 1 (id:??) landed as
https://crrev.com/2456707799f5ee29ccd0ccf7ba530d205115803c
Cr-Commit-Position: refs/heads/master@{#309592}

[Sergey Ulanov, 2014-12-24 00:38:38]

Committed patchset #1 (id:20001) manually as
2456707799f5ee29ccd0ccf7ba530d205115803c (presubmit successful).