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

webrtc/video/video_send_stream.cc

Index: webrtc/video/video_send_stream.cc
diff --git a/webrtc/video/video_send_stream.cc b/webrtc/video/video_send_stream.cc
index 73247d8d4ee24b9715d52e7014bcf95c9ccfbc36..9d87b715d8204b50eec04d4349bbbdb310ee93cd 100644
--- a/webrtc/video/video_send_stream.cc
+++ b/webrtc/video/video_send_stream.cc
@@ -626,9 +626,10 @@ VideoSendStream::VideoSendStream(
                    encoder_config.content_type),
       config_(std::move(config)),
       content_type_(encoder_config.content_type) {
-  vie_encoder_.reset(new ViEEncoder(
-      num_cpu_cores, &stats_proxy_, config_.encoder_settings,
-      config_.pre_encode_callback, config_.post_encode_callback));
+  vie_encoder_.reset(
+      new ViEEncoder(num_cpu_cores, &stats_proxy_, config_.encoder_settings,
+                     config_.pre_encode_callback, config_.post_encode_callback,
+                     content_type_));
   worker_queue_->PostTask(std::unique_ptr<rtc::QueuedTask>(new ConstructionTask(
       &send_stream_, &thread_sync_event_, &stats_proxy_, vie_encoder_.get(),
       module_process_thread, call_stats, transport, bitrate_allocator,