Move rtp-specific config out of EncoderSettings.

In VideoSendStream::Config, move payload_name and payload_type from
EncoderSettings to Rtp.

EncoderSettings now contains configuration for VideoStreamEncoder only,
and should perhaps be renamed in a follow up cl. It's no longer
passed as an argument to VideoCodecInitializer::SetupCodec.

The latter then needs a different way to know the codec type,
which is provided by a new codec_type member in VideoEncoderConfig.

Bug: webrtc:8830
Change-Id: Ifcc691aef1ee6a95e43c0452c5e630d92a511cd6
Reviewed-on: https://webrtc-review.googlesource.com/62062
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22532}
diff --git a/test/encoder_settings.h b/test/encoder_settings.h
index 25cfa29..787387b 100644
--- a/test/encoder_settings.h
+++ b/test/encoder_settings.h
@@ -45,11 +45,14 @@
     int height,
     const webrtc::VideoEncoderConfig& encoder_config);
 
-void FillEncoderConfiguration(size_t num_streams,
+void FillEncoderConfiguration(VideoCodecType codec_type, size_t num_streams,
                               VideoEncoderConfig* configuration);
 
 VideoReceiveStream::Decoder CreateMatchingDecoder(
-    const VideoSendStream::Config::EncoderSettings& encoder_settings);
+    int payload_type, const std::string& payload_name);
+
+VideoReceiveStream::Decoder CreateMatchingDecoder(
+    const VideoSendStream::Config& config);
 }  // namespace test
 }  // namespace webrtc