Updated to Chrome 45 (2454) moved from SVN to git.

core/dom/MessagePort.idl

Index: core/dom/MessagePort.idl
diff --git a/core/dom/MessagePort.idl b/core/dom/MessagePort.idl
index 77d8652d2d66e303aeccf2414d9a1d5d51b4b0c8..3c21c03bc2b3bc49a1428edc6179ccadd1f98c06 100644
--- a/core/dom/MessagePort.idl
+++ b/core/dom/MessagePort.idl
@@ -25,15 +25,17 @@
  *
  */
 
+// https://html.spec.whatwg.org/#message-ports
+
 [
     ActiveDOMObject,
-    WillBeGarbageCollected
+    Exposed=(Window,Worker),
+    GarbageCollected,
 ] interface MessagePort : EventTarget {
-    [Custom, RaisesException] void postMessage(any message, optional sequence<Transferable> transfer);
-
-    void start();
-    void close();
+    [PostMessage, RaisesException, Measure] void postMessage(any message, optional sequence<Transferable> transfer);
+    [Measure] void start();
+    [Measure] void close();
 
-    // event handler attributes
+    // event handlers
     attribute EventHandler onmessage;
 };