Web MIDI API: update open() and close() implementation

LayoutTests/webmidi/open_close.html

Index: LayoutTests/webmidi/open_close.html
diff --git a/LayoutTests/webmidi/open_close.html b/LayoutTests/webmidi/open_close.html
index 8f6bcb405d0b51b8a41b37dc0e6ae31997a50f1f..39d70234d57bc0000e5b4794517122e7e3e7560c 100644
--- a/LayoutTests/webmidi/open_close.html
+++ b/LayoutTests/webmidi/open_close.html
@@ -13,8 +13,7 @@ function checkStateTransition(options) {
     debug("- check initial state.");
     window.port = options.port;
     shouldBeEqualToString("port.connection", options.initialconnection);
-    port.onstatechange = function(e) {
-        debug("- check handler port.");
+    var checkHandler = function(e) {
         window.eventport = e.port;
         testPassed("handler is called with port " + eventport + ".");
         if (options.initialconnection == options.finalconnection) {
@@ -23,6 +22,14 @@ function checkStateTransition(options) {
         shouldBeEqualToString("eventport.id", options.port.id);
         shouldBeEqualToString("eventport.connection", options.finalconnection);
     };
+    port.onstatechange = function(e) {
+        debug("- check port handler.");
+        checkHandler(e);
+    };
+    access.onstatechange = function(e) {
+        debug("- check access handler.");
+        checkHandler(e);
+    };
     return port[options.method]().then(function(p) {
         window.callbackport = p;
         debug("- check callback arguments.");