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 358e177e3b85ec1766e6a0604346a2d81faa909e..f1b6f5ec0179bb0f75763c5f5b0206923ebf2a5c 100644
--- a/webrtc/modules/video_coding/video_sender_unittest.cc
+++ b/webrtc/modules/video_coding/video_sender_unittest.cc
@@ -78,7 +78,8 @@ 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::kVideoContent_Default, 0));
     return frame_.get();
   }