Layout Test for basic MSE seek scenario.

LayoutTests/http/tests/media/media-source/mediasource-util.js

 (function(window) {
     EventExpectationsManager = function(test)
     {
         this.test_ = test;
         this.eventTargetList_ = [];
         this.waitCallbacks_ = [];
+        this.timeoutIDs_ = {};
     };
 
     EventExpectationsManager.prototype.expectEvent = function(object, eventName, description)
     {
         var eventInfo = { 'target': object, 'type': eventName, 'description': description};
         var expectations = this.getExpectations_(object);
         expectations.push(eventInfo);
 
         var t = this;
         var waitHandler = this.test_.step_func(function() { t.handleWaitCallback_(); });
         var eventHandler = this.test_.step_func(function(event)
         {
             object.removeEventListener(eventName, eventHandler);
             var expected = expectations[0];
             assert_equals(event.target, expected.target, "Event target match.");
             assert_equals(event.type, expected.type, "Event types match.");
             assert_equals(eventInfo.description, expected.description, "Descriptions match for '" +  event.type + "'.");
 
             expectations.shift(1);
             if (t.waitCallbacks_.length > 0)
                 setTimeout(waitHandler, 0);
         });
         object.addEventListener(eventName, eventHandler);
     };
 
+    EventExpectationsManager.prototype.expectDelayedCallback = function(callback, delay)
+    {
+        var timeoutIDHolder = 0;
+        var timeoutIDs = this.timeoutIDs_;
+        // Define a wrapper function that will:
+        // 1. To indicate that this expected callback did fire, remove this
+        // timeoutID from the list of IDs we are maintaining.
+        // 2. Execute the callback that has been passed-in.
+        var callbackWrapper = function(callback) {

[acolwell GONE FROM CHROMIUM, 2013/08/05 21:06:06]

nit: callback parameter isn't necessary here. Just referencing it in this
function will make it part of the closure.

This is also where you should put the this.test_.step_func() so that the
callback is properly wrapped.

[anandc, 2013/08/06 18:03:30]

Done.

+            delete timeoutIDs[timeoutIDHolder];
+            callback();
+        }
+
+        // Execute the wrapper after the specified delay.
+        timeoutIDHolder = setTimeout(
+                                   function() { callbackWrapper(callback); },

[acolwell GONE FROM CHROMIUM, 2013/08/05 21:06:06]

nit: put the whole setTimeout call all on a single line.
"setTimeout(callbackWrapper, delay);" should work fine here given the
suggestions above.

[anandc, 2013/08/06 18:03:30]

Done.

+                                   delay);
+
+        // Add to list of timeoutIDs, which we'll use eventually to check that
+        // all expected delayed callbacks did get executed.
+        timeoutIDs[timeoutIDHolder] = timeoutIDHolder;
+    };
+
     EventExpectationsManager.prototype.waitForExpectedEvents = function(callback)
     {
         this.waitCallbacks_.push(callback);
         setTimeout(this.handleWaitCallback_.bind(this), 0);
     };
 
     EventExpectationsManager.prototype.expectingEvents = function()
     {
         for (var i = 0; i < this.eventTargetList_.length; ++i) {
             if (this.eventTargetList_[i].expectations.length > 0) {
@@ skipping 127 matching lines @@
         {
             object.addEventListener(eventName, test.step_func(function(event) { test.done(); }));
         };
 
         test.eventExpectations_ = new EventExpectationsManager(test);
         test.expectEvent = function(object, eventName, description)
         {
             test.eventExpectations_.expectEvent(object, eventName, description);
         };
 
+        test.expectDelayedCallback = function(callback, delay)
+        {
+            test.eventExpectations_.expectDelayedCallback(callback, delay);
+        }
+
         test.waitForExpectedEvents = function(callback)
         {
             test.eventExpectations_.waitForExpectedEvents(callback);
         };
 
         var oldTestDone = test.done.bind(test);
         test.done = function()
         {
-            if (test.status == test.PASS)
+            // loop through and clear timeoutIDs
+            for (var i in test.eventExpectations_.timeoutIDs_) {
+                clearTimeout(test.eventExpectations_.timeoutIDs_[i]);
+            }
+            if (test.status == test.PASS) {
                 assert_false(test.eventExpectations_.expectingEvents(), "No pending event expectations.");
+                assert_equals(Object.keys(test.eventExpectations_.timeoutIDs_).length, 0);
+            }
             oldTestDone();
         };
     };
 
     window['MediaSourceUtil'] = MediaSourceUtil;
     window['media_test'] = function(testFunction, description, options)
     {
         options = options || {};
         return async_test(function(test)
         {
@@ skipping 21 matching lines @@
             };
 
             openMediaSource_(test, mediaTag, function(mediaSource)
             {
                 testFunction(test, mediaTag, mediaSource);
             });
         }, description, options);
 
     };
 })(window);