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..0d08ed7f8c89a08a29559543d50bca8a96e2c13c 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');
             };
 
@@ -32,7 +32,11 @@
 
             var play = function() {
                 video.controller.playbackRate = 2;
-                waitForEventOnce('timeupdate', timeupdate);
+                waitForEventOnce("playing", playing);

[acolwell GONE FROM CHROMIUM, 2014/07/31 18:55:53]

nit: Just inline the function here. You don't really need to create a variable
for it since the function is only used once.

[Srirama, 2014/07/31 19:37:26]

Done.

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