[PresentationAPI] Plumbing send(Blob) 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 c5f4e44f59d89ca8de07cf8c8ba1d2edd646cc0b..6c330498a53b63d03f1084811d8c968fc46a11f1 100644
--- a/Source/modules/presentation/PresentationSession.idl
+++ b/Source/modules/presentation/PresentationSession.idl
@@ -19,7 +19,7 @@ enum PresentationSessionState {
     [RaisesException] void send(DOMString message);
     [RaisesException] void send(ArrayBuffer data);
     [RaisesException] void send(ArrayBufferView data);
-    // TODO(s.singapati): Implement Blob support, crbug.com/459008.
+    [RaisesException] void send(Blob data);
     void close();
 
     attribute EventHandler onmessage;