Add content type information to encoded images and corresponding rtp extension header

webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm

Index: webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm b/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
index 526cdbe4554614f1d9c4d47003b316b6a00780cb..920c28cd6afd9848682696ca6def6920c2acb2db 100644
--- a/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
+++ b/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
@@ -19,6 +19,7 @@
 #include "avfoundationformatmapper.h"
 
 #include "webrtc/api/video/video_rotation.h"
+#include "webrtc/api/video/video_content_type.h"
 #include "webrtc/base/bind.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
@@ -169,7 +170,8 @@ void AVFoundationVideoCapturer::CaptureSampleBuffer(
     rotation = kVideoRotation_0;
   }
 
-  OnFrame(webrtc::VideoFrame(buffer, rotation, translated_camera_time_us),
+  OnFrame(webrtc::VideoFrame(buffer, rotation, kVideoContent_Default,
+                             translated_camera_time_us),
           captured_width, captured_height);
 }