Updated structures and functions for setting the max bitrate limit to take rtc::Optional<int>

webrtc/media/base/mediachannel.h

Index: webrtc/media/base/mediachannel.h
diff --git a/webrtc/media/base/mediachannel.h b/webrtc/media/base/mediachannel.h
index 5e0f2d8bc2d6101058bf7a6193a5b618ca3fd5f7..ac00e84266900afeb20d6714d5038aca34700707 100644
--- a/webrtc/media/base/mediachannel.h
+++ b/webrtc/media/base/mediachannel.h
@@ -82,14 +82,15 @@ static std::string VectorToString(const std::vector<T>& vals) {
 }
 
 template <typename T>
-static T MinPositive(T a, T b) {
-  if (a <= 0) {
+static rtc::Optional<T> OptionalMin(rtc::Optional<T> a, rtc::Optional<T> b) {
+  if (!a) {
     return b;
   }
-  if (b <= 0) {
+  if (!b) {
     return a;
   }
-  return std::min(a, b);
+
+  return rtc::Optional<T>(std::min(*a, *b));
 }
 
 // Construction-time settings, passed to
@@ -852,12 +853,12 @@ struct RtpSendParameters : RtpParameters<Codec> {
     ost << "{";
     ost << "codecs: " << VectorToString(this->codecs) << ", ";
     ost << "extensions: " << VectorToString(this->extensions) << ", ";
-    ost << "max_bandwidth_bps: " << max_bandwidth_bps << ", ";
+    ost << "max_bitrate_bps: " << max_bitrate_bps << ", ";
     ost << "}";
     return ost.str();
   }
 
-  int max_bandwidth_bps = -1;
+  rtc::Optional<int> max_bitrate_bps;
 };
 
 struct AudioSendParameters : RtpSendParameters<AudioCodec> {
@@ -866,7 +867,7 @@ struct AudioSendParameters : RtpSendParameters<AudioCodec> {
     ost << "{";
     ost << "codecs: " << VectorToString(this->codecs) << ", ";
     ost << "extensions: " << VectorToString(this->extensions) << ", ";
-    ost << "max_bandwidth_bps: " << max_bandwidth_bps << ", ";
+    ost << "max_bitrate_bps: " << max_bitrate_bps << ", ";
     ost << "options: " << options.ToString();
     ost << "}";
     return ost.str();
@@ -1076,7 +1077,7 @@ struct DataSendParameters : RtpSendParameters<DataCodec> {
     // Options and extensions aren't used.
     ost << "{";
     ost << "codecs: " << VectorToString(codecs) << ", ";
-    ost << "max_bandwidth_bps: " << max_bandwidth_bps;
+    ost << "max_bitrate_bps: " << max_bitrate_bps;
     ost << "}";
     return ost.str();
   }