Implement writing mic audio input data to file for debugging purposes.

content/browser/media/webrtc_internals.h

Index: content/browser/media/webrtc_internals.h
diff --git a/content/browser/media/webrtc_internals.h b/content/browser/media/webrtc_internals.h
index 8ad1f2cba7bbc664409d036704bb99c564eb8504..058ceda753970a178bc526a5348f680489c37b59 100644
--- a/content/browser/media/webrtc_internals.h
+++ b/content/browser/media/webrtc_internals.h
@@ -87,16 +87,16 @@ class CONTENT_EXPORT WebRTCInternals : public RenderProcessHostObserver,
   // Sends all update data to |observer|.
   void UpdateObserver(WebRTCInternalsUIObserver* observer);
 
-  // Enables or disables AEC dump (diagnostic echo canceller recording).
-  void EnableAecDump(content::WebContents* web_contents);
-  void DisableAecDump();
+  // Enables or disables diagnostic audio recordings for debugging purposes.
+  void EnableAudioDebugRecordings(content::WebContents* web_contents);
+  void DisableAudioDebugRecordings();
 
-  bool aec_dump_enabled() {
-    return aec_dump_enabled_;
+  bool audio_debug_recordings_enabled() {
+    return audio_debug_recordings_;
   }
 
-  base::FilePath aec_dump_file_path() {
-    return aec_dump_file_path_;
+  base::FilePath audio_debug_recordings_file_path() {

[tommi (sloooow) - chröme, 2015/08/07 12:09:51]

nit: return const & and make the method const?

also, what do you think about moving these methods into the cc file and have a
thread check there so we can be sure these variables are always accessed on the
same thread?

[Henrik Grunell, 2015/08/17 15:05:16]

Agree, done.
That's good, done.

+    return audio_debug_recordings_file_path_;
   }
 
   void ResetForTesting();
@@ -128,8 +128,9 @@ class CONTENT_EXPORT WebRTCInternals : public RenderProcessHostObserver,
   void OnRendererExit(int render_process_id);
 
 #if defined(ENABLE_WEBRTC)
-  // Enables AEC dump on all render process hosts using |aec_dump_file_path_|.
-  void EnableAecDumpOnAllRenderProcessHosts();
+  // Enables diagnostic audio recordings on all render process hosts using
+  // |audio_debug_recordings_file_path_|.
+  void EnableAudioDebugRecordingsOnAllRenderProcessHosts();
 #endif
 
   // Called whenever an element is added to or removed from
@@ -167,9 +168,9 @@ class CONTENT_EXPORT WebRTCInternals : public RenderProcessHostObserver,
   // For managing select file dialog.
   scoped_refptr<ui::SelectFileDialog> select_file_dialog_;
 
-  // AEC dump (diagnostic echo canceller recording) state.
-  bool aec_dump_enabled_;
-  base::FilePath aec_dump_file_path_;
+  // Diagnostic audio recording state.
+  bool audio_debug_recordings_;
+  base::FilePath audio_debug_recordings_file_path_;
 
   // While |peer_connection_data_| is non-empty, hold an instance of
   // PowerSaveBlocker.  This prevents the application from being suspended while