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

webrtc/modules/video_coding/video_sender_unittest.cc

Index: webrtc/modules/video_coding/video_sender_unittest.cc
diff --git a/webrtc/modules/video_coding/video_sender_unittest.cc b/webrtc/modules/video_coding/video_sender_unittest.cc
index a6391ba86038c33f18f97df4e1bff6c5522913a2..9180c6958a927dae5e26f5fe8d936274196073a4 100644
--- a/webrtc/modules/video_coding/video_sender_unittest.cc
+++ b/webrtc/modules/video_coding/video_sender_unittest.cc
@@ -77,7 +77,8 @@ class EmptyFrameGenerator : public FrameGenerator {
   EmptyFrameGenerator(int width, int height) : width_(width), height_(height) {}
   VideoFrame* NextFrame() override {
     frame_.reset(new VideoFrame(I420Buffer::Create(width_, height_),
-                                webrtc::kVideoRotation_0, 0));
+                                webrtc::kVideoRotation_0,
+                                webrtc::VideoContentType::kDefault, 0));
     return frame_.get();
   }