[PresentationAPI] Plumbing send() from PresentationSession IDL to platform/.

Source/modules/presentation/PresentationSession.idl

Index: Source/modules/presentation/PresentationSession.idl
diff --git a/Source/modules/presentation/PresentationSession.idl b/Source/modules/presentation/PresentationSession.idl
index 8c942763ef22737a5cb17ec26fca1f6766f1c15e..ef1cdce6cea7c5a8e44b4ddf1dacb8af0b2cdff1 100644
--- a/Source/modules/presentation/PresentationSession.idl
+++ b/Source/modules/presentation/PresentationSession.idl
@@ -16,7 +16,10 @@ enum PresentationSessionState {
     readonly attribute DOMString? id;
     readonly attribute PresentationSessionState state;
 
-    void postMessage(DOMString message);
+    [RaisesException] void send(DOMString message);
+    [RaisesException] void send(Blob data);
+    [RaisesException] void send(ArrayBuffer data);
+    [RaisesException] void send(ArrayBufferView data);
     void close();
 
     attribute EventHandler onmessage;