Adding test for SingleNalUnit mode

modules/video_coding/codecs/test/videoprocessor.h

Index: modules/video_coding/codecs/test/videoprocessor.h
diff --git a/modules/video_coding/codecs/test/videoprocessor.h b/modules/video_coding/codecs/test/videoprocessor.h
index 98b91409406b80499818e8929f8e99ec5115d7a2..cf9692319e4594624910aff8047a1ffd45990d2e 100644
--- a/modules/video_coding/codecs/test/videoprocessor.h
+++ b/modules/video_coding/codecs/test/videoprocessor.h
@@ -18,6 +18,7 @@
 
 #include "api/video/video_frame.h"
 #include "common_video/libyuv/include/webrtc_libyuv.h"
+#include "modules/video_coding/codecs/h264/include/h264_globals.h"
 #include "modules/video_coding/codecs/test/packet_manipulator.h"
 #include "modules/video_coding/codecs/test/stats.h"
 #include "modules/video_coding/include/video_codec_interface.h"
@@ -100,6 +101,10 @@ struct TestConfig {
   // Should the hardware codecs be wrapped in software fallbacks?
   bool sw_fallback_encoder = false;
   bool sw_fallback_decoder = false;
+
+  // RTP H264 packetization mode.
+  H264PacketizationMode packetization_mode =
+      H264PacketizationMode::NonInterleaved;
 };
 
 // Handles encoding/decoding of video using the VideoEncoder/VideoDecoder