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..f09aa3de6418c154fd178eaea19c586cc501b079 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>
@@ -53,6 +54,8 @@ class PulseAudioOutputStream : public AudioOutputStream {
   void Stop() override;
   void SetVolume(double volume) override;
   void GetVolume(double* volume) override;
+  pa_threaded_mainloop* GetPAMainloop();

[Henrik Grunell, 2016/03/10 00:57:07]

Empty line before.

[rchtara, 2016/03/10 13:20:35]

Done.

+  void SetDefaultSystemDeviceName(const std::string& name);
 
  private:
   // Called by PulseAudio when |pa_stream_| change state.  If an unexpected
@@ -62,6 +65,12 @@ 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);
+  // Initialize |pa_mainloop_| and |pa_context_| and prepare them for creating

[Henrik Grunell, 2016/03/10 00:57:07]

Empty line before the comment.

[rchtara, 2016/03/10 13:20:35]

Done.

+  // an output stream.
+  bool InitializeMainloopAndContext();
+
+  // 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.
@@ -75,6 +84,10 @@ class PulseAudioOutputStream : public AudioOutputStream {
 
   // The device ID for the device to open.
   const std::string device_id_;
+  // The name of the system default device. Set by
+  // GetSystemDefaultOutputDeviceCallback if |device_id_| is set to be the
+  // default device.
+  std::string default_system_device_name_;
 
   // Audio manager that created us.  Used to report that we've closed.
   AudioManagerBase* manager_;