--- a/media/webrtc/signaling/src/sdp/SdpAttribute.h
+++ b/media/webrtc/signaling/src/sdp/SdpAttribute.h
@@ -218,16 +218,47 @@ inline std::ostream& operator<<(std::ost
       break;
     default:
       MOZ_ASSERT(false);
       os << "?";
   }
   return os;
 }
 
+inline SdpDirectionAttribute::Direction
+operator~(SdpDirectionAttribute::Direction d)
+{
+  switch (d) {
+    case SdpDirectionAttribute::Direction::kInactive:
+      return SdpDirectionAttribute::Direction::kInactive;
+    case SdpDirectionAttribute::Direction::kSendonly:
+      return SdpDirectionAttribute::Direction::kRecvonly;
+    case SdpDirectionAttribute::Direction::kRecvonly:
+      return SdpDirectionAttribute::Direction::kSendonly;
+    case SdpDirectionAttribute::Direction::kSendrecv:
+      return SdpDirectionAttribute::Direction::kSendrecv;
+  }
+  MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Invalid direction!");
+  MOZ_RELEASE_ASSERT(false);
+}
+
+inline SdpDirectionAttribute::Direction
+operator|(SdpDirectionAttribute::Direction d1,
+          SdpDirectionAttribute::Direction d2)
+{
+  return (SdpDirectionAttribute::Direction)((unsigned)d1 | (unsigned)d2);
+}
+
+inline SdpDirectionAttribute::Direction
+operator&(SdpDirectionAttribute::Direction d1,
+          SdpDirectionAttribute::Direction d2)
+{
+  return (SdpDirectionAttribute::Direction)((unsigned)d1 & (unsigned)d2);
+}
+
 ///////////////////////////////////////////////////////////////////////////
 // a=dtls-message, draft-rescorla-dtls-in-sdp
 //-------------------------------------------------------------------------
 //   attribute               =/   dtls-message-attribute
 //
 //   dtls-message-attribute  =    "dtls-message" ":" role SP value
 //
 //   role                    =    "client" / "server"