Implement periodic bandwidth probing in application-limited region.

webrtc/media/base/mediachannel.h

Index: webrtc/media/base/mediachannel.h
diff --git a/webrtc/media/base/mediachannel.h b/webrtc/media/base/mediachannel.h
index d4d339eb6e7f5f61db4c1a666dfbb73377854466..4d44bffaea098ddb0e32eb6f9af786718696313d 100644
--- a/webrtc/media/base/mediachannel.h
+++ b/webrtc/media/base/mediachannel.h
@@ -129,6 +129,9 @@ struct MediaConfig {
     // VideoReceiveStream, where the value is passed on to the
     // IncomingVideoStream constructor.
     bool disable_prerenderer_smoothing = false;
+
+    // Enables periodic bandwidth probing in application-limited region.
+    bool periodic_alr_bandwidth_probing = false;
   } video;
 };