reland 260073013: Added automatic mode to FakeInputAudioStream to generate automatic beeps

reland 260073013: Added automatic mode to FakeInputAudioStream to generate automatic beeps
 
Added automatic mode to FakeInputAudioStream to generate automatic beeps.

This patch is to allow writing audio only tests using the fake input stream, also it changes the name of the fake device from "Default" to "Fake Audio", which I hope it will make things less confusing.

NOTRY=true
TBR=grunell@chromium.org

BUG=358541
TEST=bots existing webrtc tests.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272964

[no longer working on chromium, 2014-05-27 08:34:46]

The CQ bit was checked by xians@chromium.org

[commit-bot: I haz the power, 2014-05-27 08:35:03]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xians@chromium.org/301633004/20001

[commit-bot: I haz the power, 2014-05-27 08:35:04]

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

[commit-bot: I haz the power, 2014-05-27 08:35:04]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Henrik Grunell, 2014-05-27 09:04:55]

LGTM on the fix patch set 1->2.

[no longer working on chromium, 2014-05-27 09:08:34]

The CQ bit was checked by xians@chromium.org

[commit-bot: I haz the power, 2014-05-27 09:09:08]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xians@chromium.org/301633004/20001

[commit-bot: I haz the power, 2014-05-27 11:18:40]

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:
  android_aosp on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_aosp/builds/7...)
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-05-27 11:27:02]

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

[commit-bot: I haz the power, 2014-05-27 11:27:03]

Try jobs failed on following builders:
  android_aosp on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_aosp/builds/7...)

[no longer working on chromium, 2014-05-27 13:51:39]

The CQ bit was checked by xians@chromium.org

[commit-bot: I haz the power, 2014-05-27 13:52:02]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xians@chromium.org/301633004/20001

[commit-bot: I haz the power, 2014-05-27 13:53:02]

Change committed as 272964