Re-organize CreateDataChannel function and add limited spec compliance

rtcdatachannelinit.go

@@ -5,8 +5,7 @@ package webrtc
 type RTCDataChannelInit struct {
 	// Ordered indicates if data is allowed to be delivered out of order. The
 	// default value of true, guarantees that data will be delivered in order.
-	// TODO make sure defaults to true
-	Ordered bool
+	Ordered *bool
 
 	// MaxPacketLifeTime limits the time (in milliseconds) during which the
 	// channel will transmit or retransmit data if not acknowledged. This value
@@ -19,7 +18,7 @@ type RTCDataChannelInit struct {
 	MaxRetransmits *uint16
 
 	// Protocol describes the subprotocol name used for this channel.
-	Protocol string
+	Protocol *string
 
 	// Negotiated describes if the data channel is created by the local peer or
 	// the remote peer. The default value of false tells the user agent to
@@ -27,11 +26,11 @@ type RTCDataChannelInit struct {
 	// corresponding RTCDataChannel. If set to true, it is up to the application
 	// to negotiate the channel and create an RTCDataChannel with the same id
 	// at the other peer.
-	Negotiated bool
+	Negotiated *bool
 
 	// ID overrides the default selection of ID for this channel.
-	ID uint16
+	ID *uint16
 
 	// Priority describes the priority of this channel.
-	Priority RTCPriorityType
+	Priority *RTCPriorityType
 }