alsa_output: Drain and pause pcm when stopping.

media/audio/linux/alsa_output.cc

Index: media/audio/linux/alsa_output.cc
diff --git a/media/audio/linux/alsa_output.cc b/media/audio/linux/alsa_output.cc
index ce301cef903713b1629b85012064fc3802969d83..dc4135b76782c91571cb55afc1a847292f2e57c2 100644
--- a/media/audio/linux/alsa_output.cc
+++ b/media/audio/linux/alsa_output.cc
@@ -334,6 +334,8 @@ void AlsaPcmOutputStream::Stop() {
 
   // Reset the callback, so that it is not called anymore.
   set_source_callback(NULL);
+  // Finish playing samples and pause the pcm.

[scherkus (not reviewing), 2012/05/24 17:57:28]

nit: we're pretty generous with vertical whitespace, so we typically have a
blank line before each // comment unless it's the first line of a new scope
(rest of this file follows that style)

+  wrapper_->PcmDrain(playback_handle_);
 
   TransitionTo(kIsStopped);
 }