Revert "Reland "Remove GICE (gone forever!) and PORTALLOCATOR_ENABLE_SHARED_UFRAG (enabled forever)…

talk/session/media/mediasession.h

Index: talk/session/media/mediasession.h
diff --git a/talk/session/media/mediasession.h b/talk/session/media/mediasession.h
index d329dcdf27b72271ee16496b93104e65fa1ec51e..5bcc8cc55bd6cd29245af1c71308763f49987269 100644
--- a/talk/session/media/mediasession.h
+++ b/talk/session/media/mediasession.h
@@ -547,6 +547,25 @@ const VideoContentDescription* GetFirstVideoContentDescription(
 const DataContentDescription* GetFirstDataContentDescription(
     const SessionDescription* sdesc);
 
+// Functions for translating media candidate names.
+
+// For converting between media ICE component and G-ICE channel
+// names.  For example:
+// "rtp" <=> 1
+// "rtcp" <=> 2
+// "video_rtp" <=> 1
+// "video_rtcp" <=> 2
+// Will not convert in the general case of arbitrary channel names,
+// but is useful for cases where we have candidates for media
+// channels.
+// returns false if there is no mapping.
+bool GetMediaChannelNameFromComponent(
+    int component, cricket::MediaType media_type, std::string* channel_name);
+bool GetMediaComponentFromChannelName(
+    const std::string& channel_name, int* component);
+bool GetMediaTypeFromChannelName(
+    const std::string& channel_name, cricket::MediaType* media_type);
+
 void GetSupportedAudioCryptoSuites(std::vector<std::string>* crypto_suites);
 void GetSupportedVideoCryptoSuites(std::vector<std::string>* crypto_suites);
 void GetSupportedDataCryptoSuites(std::vector<std::string>* crypto_suites);