Add new codec for FlexFEC.

This CL does nothing except adding new strings and enums corresponding to
the new codec.

R=stefan@webrtc.org
BUG=webrtc:5654

Review-Url: https://codereview.webrtc.org/2470103002
Cr-Commit-Position: refs/heads/master@{#14943}
diff --git a/webrtc/sdk/objc/Framework/Classes/RTCRtpCodecParameters.mm b/webrtc/sdk/objc/Framework/Classes/RTCRtpCodecParameters.mm
index 7704769..40f4f25 100644
--- a/webrtc/sdk/objc/Framework/Classes/RTCRtpCodecParameters.mm
+++ b/webrtc/sdk/objc/Framework/Classes/RTCRtpCodecParameters.mm
@@ -17,6 +17,7 @@
 const NSString * const kRTCRtxCodecMimeType = @(cricket::kRtxCodecName);
 const NSString * const kRTCRedCodecMimeType = @(cricket::kRedCodecName);
 const NSString * const kRTCUlpfecCodecMimeType = @(cricket::kUlpfecCodecName);
+const NSString * const kRTCFlexfecCodecMimeType = @(cricket::kFlexfecCodecName);
 const NSString * const kRTCOpusCodecMimeType = @(cricket::kOpusCodecName);
 const NSString * const kRTCIsacCodecMimeType = @(cricket::kIsacCodecName);
 const NSString * const kRTCL16CodecMimeType  = @(cricket::kL16CodecName);