Updates to video config to allow changes in google3 tests, in order to not break anything.

Bug: webrtc:8630
Change-Id: I71bfd3f01344c80a83b728385b9231b47ee1fd5d
Reviewed-on: https://webrtc-review.googlesource.com/32460
Commit-Queue: Seth Hampson <shampson@webrtc.org>
Reviewed-by: Elad Alon <eladalon@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21373}

api/rtpparameters.cc

@@ -17,6 +17,8 @@
 
 namespace webrtc {
 
+const double kDefaultBitratePriority = 1.0;
+
 RtcpFeedback::RtcpFeedback() {}
 RtcpFeedback::RtcpFeedback(RtcpFeedbackType type) : type(type) {}
 RtcpFeedback::RtcpFeedback(RtcpFeedbackType type,

api/rtpparameters.h

@@ -72,6 +72,7 @@ enum class DegradationPreference {
   BALANCED,
 };
 
+extern const double kDefaultBitratePriority;
 enum class PriorityType { VERY_LOW, LOW, MEDIUM, HIGH };
 
 struct RtcpFeedback {

call/video_config.cc

@@ -54,6 +54,7 @@ VideoEncoderConfig::VideoEncoderConfig()
       encoder_specific_settings(nullptr),
       min_transmit_bitrate_bps(0),
       max_bitrate_bps(0),
+      bitrate_priority(1.0),
       number_of_streams(0) {}
 
 VideoEncoderConfig::VideoEncoderConfig(VideoEncoderConfig&&) = default;

call/video_config.h

@@ -35,6 +35,7 @@ struct VideoStream {
   int min_bitrate_bps;
   int target_bitrate_bps;
   int max_bitrate_bps;
+  rtc::Optional<double> bitrate_priority;
 
   int max_qp;
 
@@ -142,6 +143,8 @@ class VideoEncoderConfig {
   // unless the estimated bandwidth indicates that the link can handle it.
   int min_transmit_bitrate_bps;
   int max_bitrate_bps;
+  // The bitrate priority used for all VideoStreams.
+  double bitrate_priority;
 
   // Max number of encoded VideoStreams to produce.
   size_t number_of_streams;