Presentation API: add UMA.

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 493f8ca4ed858ba2222e846e41c141ed8d924a4d..08f6b0574c61260dda5886e76b4b5390ec61c089 100644
--- a/Source/modules/presentation/PresentationSession.idl
+++ b/Source/modules/presentation/PresentationSession.idl
@@ -15,14 +15,14 @@ enum PresentationSessionState {
 ] interface PresentationSession : EventTarget {
     readonly attribute DOMString? id;
     readonly attribute PresentationSessionState state;
-    void close();
+    [MeasureAs=PresentationSessionClose] void close();
     attribute EventHandler onstatechange;
 
     // Communication
     attribute BinaryType binaryType;
     attribute EventHandler onmessage;
-    [RaisesException] void send(DOMString message);
-    [RaisesException] void send(Blob data);
-    [RaisesException] void send(ArrayBuffer data);
-    [RaisesException] void send(ArrayBufferView data);
+    [RaisesException, MeasureAs=PresentationSessionSend] void send(DOMString message);
+    [RaisesException, MeasureAs=PresentationSessionSend] void send(Blob data);
+    [RaisesException, MeasureAs=PresentationSessionSend] void send(ArrayBuffer data);
+    [RaisesException, MeasureAs=PresentationSessionSend] void send(ArrayBufferView data);
 };