Create a private API for controlling WebRTC's AEC3

chrome/common/extensions/api/webrtc_audio_private.idl

Index: chrome/common/extensions/api/webrtc_audio_private.idl
diff --git a/chrome/common/extensions/api/webrtc_audio_private.idl b/chrome/common/extensions/api/webrtc_audio_private.idl
index 32afbd48ee9288b4e4fac6c9807775132584a8e7..31404bd536770697140ed4fc7b24e7c6095f6fc9 100644
--- a/chrome/common/extensions/api/webrtc_audio_private.idl
+++ b/chrome/common/extensions/api/webrtc_audio_private.idl
@@ -50,6 +50,11 @@ namespace webrtcAudioPrivate {
     long? guestProcessId;
   };
 
+  dictionary AudioExperiments {
+    // Enables or disables the new acoustic echo canceller (AEC3) in WebRTC.
+    boolean? enableAec3;
+  };
+
   interface Functions {
     // Retrieves a list of available audio sink devices.
     static void getSinks(GetSinksCallback callback);
@@ -75,6 +80,12 @@ namespace webrtcAudioPrivate {
     static void getAssociatedSink(DOMString securityOrigin,
                                   DOMString sourceIdInOrigin,
                                   SinkIdCallback cb);
+
+    // Provides settings to experiments related to WebRTC audio.
+    static void setAudioExperiments(RequestInfo request,
+                                    DOMString securityOrigin,
+                                    AudioExperiments audioExperiments,
+                                    optional CompletionCallback callback);
   };
 
   interface Events {