https://bugs.webkit.org/show_bug.cgi?id=117034

Reviewed by Beth Dakin.

This test does not wait until a seek completes before issuing a play()
command during its subtests. This can cause flakiness on some platforms
where playback will begin from the pre-seek currentTime. Wait for the seek
to complete before continuing the sub-tests.

Additionally, a 2s watchdog timeout is present to catch stalled tests. This
timeout is fine for short-duration sub-tests, but longer tests' durations
approach this 2s timeout period. Make the timeout the test duration + 2s.

* media/video-played-collapse-expected.txt:
* media/video-played-collapse.html:
* media/video-played.js:
(playForMillisecs.callPauseIfTimeIsReached):
(playForMillisecs):
* platform/mac-wk2/TestExpectations:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@151942 268f45cc-cd09-0410-ab3c-d52691b4dbfc