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

webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc

Index: webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
diff --git a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
index 6e7e468123160cead39ad1ceaef74245cea22718..a5353333d0b8a4beff28e75ed23ddb0b9c9ba0cd 100644
--- a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
+++ b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
@@ -703,6 +703,7 @@ int VP9EncoderImpl::GetEncodedLayerFrame(const vpx_codec_cx_pkt* pkt) {
     encoded_image_._timeStamp = input_image_->timestamp();
     encoded_image_.capture_time_ms_ = input_image_->render_time_ms();
     encoded_image_.rotation_ = input_image_->rotation();
+    encoded_image_.content_type_ = input_image_->content_type();
     encoded_image_._encodedHeight = raw_->d_h;
     encoded_image_._encodedWidth = raw_->d_w;
     int qp = -1;
@@ -972,7 +973,8 @@ int VP9DecoderImpl::ReturnFrame(const vpx_image_t* img,
           rtc::KeepRefUntilDone(img_buffer)));
 
   VideoFrame decoded_image(img_wrapped_buffer, timestamp,
-                           0 /* render_time_ms */, webrtc::kVideoRotation_0);
+                           0 /* render_time_ms */, webrtc::kVideoRotation_0,
+                           webrtc::kVideoContent_Default);
   decoded_image.set_ntp_time_ms(ntp_time_ms);
 
   decode_complete_callback_->Decoded(decoded_image, rtc::Optional<int32_t>(),