Let default device in PulseAudio be the system default device

media/audio/pulse/pulse_output.h

Index: media/audio/pulse/pulse_output.h
diff --git a/media/audio/pulse/pulse_output.h b/media/audio/pulse/pulse_output.h
index ce9a58914ece8af79409b0c537605e650d59060c..5c8a592fc979db44d14f494ca35b2d6fa3939870 100644
--- a/media/audio/pulse/pulse_output.h
+++ b/media/audio/pulse/pulse_output.h
@@ -20,6 +20,7 @@
 #ifndef MEDIA_AUDIO_PULSE_PULSE_OUTPUT_H_
 #define MEDIA_AUDIO_PULSE_PULSE_OUTPUT_H_
 
+#include <pulse/pulseaudio.h>
 #include <stddef.h>
 
 #include <string>
@@ -63,6 +64,19 @@ class PulseAudioOutputStream : public AudioOutputStream {
   // Called by PulseAudio when it needs more audio data.
   static void StreamRequestCallback(pa_stream* s, size_t len, void* p_this);
 
+  // pa_context_get_server_info callback. It's used by
+  // GetSystemDefaultOutputDevice to set |device_name_| to the
+  // default system output device.
+  static void GetSystemDefaultOutputDeviceCallback(pa_context* context,
+                                                   const pa_server_info* info,
+                                                   void* user_data);
+
+  bool InitializeMainloopAndContext(std::string& app_name,

[Henrik Grunell, 2016/03/09 00:49:17]

Add comment with description.

[Henrik Grunell, 2016/03/09 00:49:17]

const std::string& (both arguments).

[rchtara, 2016/03/09 16:16:10]

Done.

[rchtara, 2016/03/09 16:16:10]

Done.

+                                    std::string& device_to_use_);

[Henrik Grunell, 2016/03/09 00:49:17]

Remove trailing "_".

[rchtara, 2016/03/09 16:16:10]

Done.

+
+  // Get default system output device for the output stream.
+  void GetSystemDefaultOutputDevice();
+
   // Fulfill a write request from the write request callback.  Outputs silence
   // if the request could not be fulfilled.
   void FulfillWriteRequest(size_t requested_bytes);
@@ -75,6 +89,9 @@ class PulseAudioOutputStream : public AudioOutputStream {
 
   // The device ID for the device to open.
   const std::string device_id_;
+  // The name of the system default device. Returned
+  // by GetSystemDefaultOutputDeviceCallback.
+  std::string default_system_device_name_;
 
   // Audio manager that created us.  Used to report that we've closed.
   AudioManagerBase* manager_;