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..02c0496e5bb9760336be3a1c92478dc0ccc3bc9b 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 +30,12 @@
         object.addEventListener(eventName, eventHandler);
     };
 
+    EventExpectationsManager.prototype.callOnTimeout = function(callback, timeout)
+    {
+        var timeoutID = setTimeout(callback, timeout);

[wolenetz, 2013/07/31 19:42:37]

For purposes of automatically failing the test if not all expected timeouts have
occurred by the time test.done() is running, need to intercept the callback with
a wrapping function that removes timeoutID from this.timeoutIDs_. Also,
test.done() needs to check if all timeout expectations have been met.

[anandc, 2013/07/31 22:17:32]

Done.

+        this.timeoutIDs_.push(timeoutID);
+    };
+
     EventExpectationsManager.prototype.waitForExpectedEvents = function(callback)
     {
         this.waitCallbacks_.push(callback);
@@ -176,6 +183,11 @@
             test.eventExpectations_.expectEvent(object, eventName, description);
         };
 
+        test.callOnTimeout = function(callback, timeout)

[wolenetz, 2013/07/31 19:42:37]

nit: Would 'expectTimeout' be better?

[anandc, 2013/07/31 22:17:32]

Now named expectDelayedCallback.

+        {
+            test.eventExpectations_.callOnTimeout(callback, timeout);
+        }
+
         test.waitForExpectedEvents = function(callback)
         {
             test.eventExpectations_.waitForExpectedEvents(callback);
@@ -184,6 +196,12 @@
         var oldTestDone = test.done.bind(test);
         test.done = function()
         {
+            // loop through and clear timeoutIDs
+            var timeoutIDs = test.eventExpectations_.timeoutIDs_;
+            while (timeoutIDs.length > 0) {
+                clearTimeout(timeoutIDs.shift());
+            }
+
             if (test.status == test.PASS)
                 assert_false(test.eventExpectations_.expectingEvents(), "No pending event expectations.");

[wolenetz, 2013/07/31 19:42:37]

Need to also assert that there are no pending timeouts still expected (other
than any in the test harness or others unmanaged by EventExpectationsManager.

[anandc, 2013/07/31 22:17:32]

Done.

             oldTestDone();