ServiceWorker: Implement 'source' and 'origin' attributes of ExtendableMessageEvent

third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-event-async-respond-with.html

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-event-async-respond-with.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-event-async-respond-with.html b/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-event-async-respond-with.html
index c27fbd597eaaf5e8bbfcec80d9437cce645bd811..f911041ef224730f8a1978e469c537deac77cdd5 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-event-async-respond-with.html
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-event-async-respond-with.html
@@ -16,13 +16,13 @@ promise_test(function(t) {
           return with_iframe(scope);
         })
       .then(function(frame) {
+          add_completion_callback(function() { frame.remove(); });
           var channel = new MessageChannel();
           var saw_message = new Promise(function(resolve) {
               channel.port1.onmessage = function(e) { resolve(e.data); }
             });
           var worker = frame.contentWindow.navigator.serviceWorker.controller;
 
-          frame.remove();

[nhiroki, 2016/03/01 09:28:29]

fyi: This frame should be removed after posting a message because |worker| is
associated with the frame and postMessage now checks its validity (see
ServiceWorker::postMessage).

           worker.postMessage({port: channel.port2}, [channel.port2]);
           return saw_message;
         })