Clear the FIFO when calling input stream::Stop()

Clear the FIFO when calling input stream::Stop()

BUG=
TEST=bots.

Committed: https://crrev.com/046de0e4e7c3aba3e5fd922549c6b42a72eb02a5
Cr-Commit-Position: refs/heads/master@{#297904}

[no longer working on chromium, 2014-10-02 19:57:47]

xians@chromium.org changed reviewers:
+ dalecurtis@chromium.org

[no longer working on chromium, 2014-10-02 19:58:33]

Dale, could you please review this small CL, I have already verified that there
is no need to do change on windows, android, and alsa.

[DaleCurtis, 2014-10-02 20:00:26]

lgtm

[no longer working on chromium, 2014-10-02 20:01:14]

The CQ bit was checked by xians@chromium.org

[no longer working on chromium, 2014-10-02 20:01:33]

On 2014/10/02 20:00:26, DaleCurtis wrote:
> lgtm

Thanks.

[no longer working on chromium, 2014-10-02 20:01:36]

On 2014/10/02 20:00:26, DaleCurtis wrote:
> lgtm

Thanks.

[commit-bot: I haz the power, 2014-10-02 20:04:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/621093002/20001

[commit-bot: I haz the power, 2014-10-02 21:18:23]

Committed patchset #2 (id:20001) as 42c167baeb932c4c0302356b79f1b6fa728e4d38

[commit-bot: I haz the power, 2014-10-02 21:18:56]

Patchset 2 (id:??) landed as
https://crrev.com/046de0e4e7c3aba3e5fd922549c6b42a72eb02a5
Cr-Commit-Position: refs/heads/master@{#297904}