Introduce AudioHardwareConfig for renderer side audio device info.

media/audio/audio_output_controller.cc

Index: media/audio/audio_output_controller.cc
diff --git a/media/audio/audio_output_controller.cc b/media/audio/audio_output_controller.cc
index e3464fd6fdf9acc5f11f56a6b5f20071279159fa..9e13a10b9bdb7373d77eac328acc5be9fa3ff169 100644
--- a/media/audio/audio_output_controller.cc
+++ b/media/audio/audio_output_controller.cc
@@ -10,6 +10,7 @@
 #include "base/threading/platform_thread.h"
 #include "base/time.h"
 #include "build/build_config.h"
+#include "media/audio/audio_util.h"
 #include "media/audio/shared_memory_util.h"
 
 using base::Time;
@@ -328,6 +329,10 @@ void AudioOutputController::DoStopCloseAndClearStream() {
 void AudioOutputController::OnDeviceChange() {
   DCHECK(message_loop_->BelongsToCurrentThread());
 
+  // TODO(dalecurtis): Notify the renderer side that a device change has
+  // occurred.  Currently querying the hardware information here will lead to
+  // crashes on OSX.  See http://crbug.com/158170.
+
   // Recreate the stream (DoCreate() will first shut down an existing stream).
   // Exit if we ran into an error.
   const State original_state = state_;