Fix media layout tests that made invalid assumptions about timeupdate.

LayoutTests/media/media-controller-effective-playback-rate.html

Index: LayoutTests/media/media-controller-effective-playback-rate.html
diff --git a/LayoutTests/media/media-controller-effective-playback-rate.html b/LayoutTests/media/media-controller-effective-playback-rate.html
index e0d28631db9727e37d01066e75ea2a994524a62c..143509ff984af6ec9205cd1f0814da375aa56b41 100644
--- a/LayoutTests/media/media-controller-effective-playback-rate.html
+++ b/LayoutTests/media/media-controller-effective-playback-rate.html
@@ -26,6 +26,12 @@
                 testExpected("video.controller.playbackRate", 1);
                 testExpected("video.playbackRate", 0);
 
+                // Wait for bringing up to speed step to complete.

[acolwell GONE FROM CHROMIUM, 2014/09/16 21:46:13]

nit: perhaps mention that "bringing up to speed" initiates a seek on the media
element so this is a little more obvious w/o looking at the spec.

[scherkus (not reviewing), 2014/09/16 22:13:31]

Done.

+                waitForEventOnce('seeked', seeked);
+            };
+
+            var seeked = function()
+            {
                 // Initiate playback and verify that time moves forward.
                 run("video.play()");
                 waitForEventOnce("play", play);