Expose RTCDataChannel and RTCDataChannelEvent (with constructor)

third_party/WebKit/Source/modules/peerconnection/RTCDataChannelEvent.cpp

Index: third_party/WebKit/Source/modules/peerconnection/RTCDataChannelEvent.cpp
diff --git a/third_party/WebKit/Source/modules/peerconnection/RTCDataChannelEvent.cpp b/third_party/WebKit/Source/modules/peerconnection/RTCDataChannelEvent.cpp
index 6fe8461d25b393a917729db40aa676c5ccd19608..d8f8e55254cf3cb217023aed7d7952cc2ae140b3 100644
--- a/third_party/WebKit/Source/modules/peerconnection/RTCDataChannelEvent.cpp
+++ b/third_party/WebKit/Source/modules/peerconnection/RTCDataChannelEvent.cpp
@@ -33,12 +33,23 @@ RTCDataChannelEvent* RTCDataChannelEvent::create(const AtomicString& type,
   return new RTCDataChannelEvent(type, canBubble, cancelable, channel);
 }
 
+RTCDataChannelEvent* RTCDataChannelEvent::create(
+    const AtomicString& type,
+    const RTCDataChannelEventInit& initializer) {
+  return new RTCDataChannelEvent(type, initializer);
+}
+
 RTCDataChannelEvent::RTCDataChannelEvent(const AtomicString& type,
                                          bool canBubble,
                                          bool cancelable,
                                          RTCDataChannel* channel)
     : Event(type, canBubble, cancelable), m_channel(channel) {}
 
+RTCDataChannelEvent::RTCDataChannelEvent(
+    const AtomicString& type,
+    const RTCDataChannelEventInit& initializer)
+    : Event(type, initializer), m_channel(initializer.channel()) {}
+
 RTCDataChannelEvent::~RTCDataChannelEvent() {}
 
 RTCDataChannel* RTCDataChannelEvent::channel() const {