Audio output debug recording.

content/browser/webrtc/webrtc_internals.cc

Index: content/browser/webrtc/webrtc_internals.cc
diff --git a/content/browser/webrtc/webrtc_internals.cc b/content/browser/webrtc/webrtc_internals.cc
index 677e7e26c6ea037c1bc73374c7128bd51e126e84..dee0c97f6e02867485153ec9df98751b36c5c7cb 100644
--- a/content/browser/webrtc/webrtc_internals.cc
+++ b/content/browser/webrtc/webrtc_internals.cc
@@ -19,6 +19,7 @@
 #include "content/public/browser/web_contents.h"
 #include "device/power_save_blocker/power_save_blocker.h"
 #include "ipc/ipc_platform_file.h"
+#include "media/audio/audio_manager.h"
 #include "media/media_features.h"
 
 #if defined(OS_WIN)
@@ -323,13 +324,22 @@ void WebRTCInternals::DisableAudioDebugRecordings() {
 
   // Tear down the dialog since the user has unchecked the audio debug
   // recordings box.
-  select_file_dialog_ = NULL;
+  select_file_dialog_ = nullptr;
 
   for (RenderProcessHost::iterator i(
            content::RenderProcessHost::AllHostsIterator());
        !i.IsAtEnd(); i.Advance()) {
     i.GetCurrentValue()->DisableAudioDebugRecordings();
   }
+
+  // It's safe to get the AudioManager pointer here. That pointer is invalidated
+  // on the UI thread, which we're on.
+  // AudioManager is deleted on the audio thread, and the AudioManager outlives
+  // this object, so it's safe to post unretained to the audio thread.
+  media::AudioManager* audio_manager = media::AudioManager::Get();
+  audio_manager->GetTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&media::AudioManager::DisableOutputDebugRecording,
+                            base::Unretained(audio_manager)));
 #endif
 }
 
@@ -493,12 +503,23 @@ void WebRTCInternals::EnableAudioDebugRecordingsOnAllRenderProcessHosts() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   audio_debug_recordings_ = true;
+
   for (RenderProcessHost::iterator i(
            content::RenderProcessHost::AllHostsIterator());
        !i.IsAtEnd(); i.Advance()) {
     i.GetCurrentValue()->EnableAudioDebugRecordings(
         audio_debug_recordings_file_path_);
   }
+
+  // It's safe to get the AudioManager pointer here. That pointer is invalidated
+  // on the UI thread, which we're on.
+  // AudioManager is deleted on the audio thread, and the AudioManager outlives
+  // this object, so it's safe to post unretained to the audio thread.
+  media::AudioManager* audio_manager = media::AudioManager::Get();
+  audio_manager->GetTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&media::AudioManager::EnableOutputDebugRecording,
+                            base::Unretained(audio_manager),
+                            audio_debug_recordings_file_path_));
 }
 
 void WebRTCInternals::EnableEventLogRecordingsOnAllRenderProcessHosts() {