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

webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.cc

Index: webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.cc
diff --git a/webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.cc b/webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.cc
index 8407451bd4d7658595c28acba9ec04bcb7d1c997..e34304ea0d1dbd937bc0f87db4fb039c91f33047 100644
--- a/webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.cc
+++ b/webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.cc
@@ -156,13 +156,10 @@ int H264DecoderImpl::AVGetBuffer2(
   // TODO(nisse): The VideoFrame's timestamp and rotation info is not used.
   // Refactor to do not use a VideoFrame object at all.
   av_frame->buf[0] = av_buffer_create(
-      av_frame->data[kYPlaneIndex],
-      total_size,
-      AVFreeBuffer2,
-      static_cast<void*>(new VideoFrame(frame_buffer,
-                                        0 /* timestamp */,
-                                        0 /* render_time_ms */,
-                                        kVideoRotation_0)),
+      av_frame->data[kYPlaneIndex], total_size, AVFreeBuffer2,
+      static_cast<void*>(new VideoFrame(
+          frame_buffer, 0 /* timestamp */, 0 /* render_time_ms */,
+          kVideoRotation_0, kVideoContent_Default)),
       0);
   RTC_CHECK(av_frame->buf[0]);
   return 0;
@@ -380,7 +377,7 @@ int32_t H264DecoderImpl::Decode(const EncodedImage& input_image,
             rtc::KeepRefUntilDone(buf)));
     VideoFrame cropped_frame(
         cropped_buf, video_frame->timestamp(), video_frame->render_time_ms(),
-        video_frame->rotation());
+        video_frame->rotation(), video_frame->content_type());
     // TODO(nisse): Timestamp and rotation are all zero here. Change decoder
     // interface to pass a VideoFrameBuffer instead of a VideoFrame?
     decoded_image_callback_->Decoded(cropped_frame, rtc::Optional<int32_t>(),