Always notify the MediaPlayer of any seek.

LayoutTests/media/media-controller-playbackrate.html

Index: LayoutTests/media/media-controller-playbackrate.html
diff --git a/LayoutTests/media/media-controller-playbackrate.html b/LayoutTests/media/media-controller-playbackrate.html
index e5a142b44a91494a8e26532d624c85a48e3cda43..e74a3020761c1b2357cb11856a1da5d30faccaa5 100644
--- a/LayoutTests/media/media-controller-playbackrate.html
+++ b/LayoutTests/media/media-controller-playbackrate.html
@@ -6,7 +6,7 @@
         <script>
             var start = function() {
                 findMediaElement();
-                waitForEvent('canplay',canplay);
+                waitForEventOnce('canplay',canplay);
                 video.src = findMediaFile('video', 'content/test');
             };
 
@@ -28,11 +28,13 @@
                 video.controller.defaultPlaybackRate = 0;
                 waitForEvent('play', play);
                 video.play();
-            };
-
-            var play = function() {
-                video.controller.playbackRate = 2;
-                waitForEventOnce('timeupdate', timeupdate);
+            };
+
+            var play = function() {
+                video.controller.playbackRate = 2;
+                waitForEventOnce("playing", function() {

[acolwell GONE FROM CHROMIUM, 2014/07/31 20:00:16]

ditto

[Srirama, 2014/07/31 20:20:18]

Done.

+                    waitForEventOnce("timeupdate", timeupdate);
+                });
             };
 
             var timeupdate = function() {