Linux: Do not use a hard coded app name for PulseAudio output.

media/audio/audio_manager_base.h

Index: media/audio/audio_manager_base.h
diff --git a/media/audio/audio_manager_base.h b/media/audio/audio_manager_base.h
index 346fe47f79bb6ab2b6931f3ba38edd452e12cb16..4f65972b9f98df066832ee19efe8eccda9f490f2 100644
--- a/media/audio/audio_manager_base.h
+++ b/media/audio/audio_manager_base.h
@@ -50,6 +50,15 @@ class MEDIA_EXPORT AudioManagerBase : public AudioManager {
   // stream, otherwise stream initialization may fail.
   static const char kLoopbackInputDeviceId[];
 
+#if defined(OS_LINUX)
+  // Sets the name of the audio source as seen by external apps. Only actually
+  // used with PulseAudio as of this writing.
+  static void SetGlobalAppName(const std::string& app_name);
+
+  // Returns the app name or an empty string if it is not set.
+  static const std::string& GetGlobalAppName();
+#endif
+
   ~AudioManagerBase() override;
 
   // AudioManager: