Layout Test for basic MSE seek scenario.

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

Index: LayoutTests/http/tests/media/media-source/mediasource-util.js
diff --git a/LayoutTests/http/tests/media/media-source/mediasource-util.js b/LayoutTests/http/tests/media/media-source/mediasource-util.js
index 456f012f4d99dc613dbdf3ac07f224d518097e76..02bdd53b8c3f4cf16771158c4ff243734f67da53 100644
--- a/LayoutTests/http/tests/media/media-source/mediasource-util.js
+++ b/LayoutTests/http/tests/media/media-source/mediasource-util.js
@@ -4,6 +4,7 @@
         this.test_ = test;
         this.eventTargetList_ = [];
         this.waitCallbacks_ = [];
+        this.timeoutIDs_ = {};
     };
 
     EventExpectationsManager.prototype.expectEvent = function(object, eventName, description)
@@ -29,6 +30,29 @@
         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 = this.test_.step_func(function() {
+            delete timeoutIDs[timeoutIDHolder];
+            callback();
+        });
+
+        // Default to a wait time of 300ms.

[anandc, 2013/08/06 18:03:31]

OK to manage the delay in this manner?

+        delay = (typeof delay === "undefined") ? 300 : delay;
+        // Execute the wrapper after the specified or default delay.
+        timeoutIDHolder = setTimeout(function() { callbackWrapper(); }, delay);

[acolwell GONE FROM CHROMIUM, 2013/08/06 18:42:37]

nit: You shouldn't need to wrap callbackWrapper here.
setTimeout(callbackWrapper, delay); should work.

[anandc, 2013/08/06 21:30:51]

Got it. This function has been removed now. PTAL at waitForTimeUpdate.

[anandc, 2013/08/06 21:55:30]

Hmm. Not removed, so fixing.

[anandc, 2013/08/06 21:57:39]

Actually removed. :-)

+
+        // 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);
@@ -176,6 +200,11 @@
             test.eventExpectations_.expectEvent(object, eventName, description);
         };
 
+        test.expectDelayedCallback = function(callback, delay)
+        {
+            test.eventExpectations_.expectDelayedCallback(callback, delay);
+        }
+
         test.waitForExpectedEvents = function(callback)
         {
             test.eventExpectations_.waitForExpectedEvents(callback);
@@ -184,8 +213,14 @@
         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();
         };
     };