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

Source/modules/presentation/PresentationSession.h

Index: Source/modules/presentation/PresentationSession.h
diff --git a/Source/modules/presentation/PresentationSession.h b/Source/modules/presentation/PresentationSession.h
index 1fc4c309f8a8c8b0dbfa5ba1515fba0a31d0da8d..466e46f4bcef05ec9fa14ffe96e9849ce9e73a58 100644
--- a/Source/modules/presentation/PresentationSession.h
+++ b/Source/modules/presentation/PresentationSession.h
@@ -6,6 +6,7 @@
 #define PresentationSession_h
 
 #include "core/events/EventTarget.h"
+#include "core/fileapi/Blob.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "public/platform/modules/presentation/WebPresentationSessionClient.h"
 #include "wtf/text/WTFString.h"
@@ -16,6 +17,8 @@ class AtomicString;
 
 namespace blink {
 
+class DOMArrayBuffer;
+class DOMArrayBufferView;
 class Presentation;
 class PresentationController;
 
@@ -39,7 +42,10 @@ public:
     const String id() const { return m_id; }
     const WTF::AtomicString& state() const;
 
-    void postMessage(const String& message);
+    void postMessage(const String& message, ExceptionState&);
+    void postMessage(Blob* data, ExceptionState&);
+    void postMessage(DOMArrayBuffer* data, ExceptionState&);
+    void postMessage(DOMArrayBufferView* data, ExceptionState&);
     void close();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(message);