Relanding 'Always notify the MediaPlayer of any seek' patch

LayoutTests/media/controls-timeline-with-controller.html

Index: LayoutTests/media/controls-timeline-with-controller.html
diff --git a/LayoutTests/media/controls-timeline-with-controller.html b/LayoutTests/media/controls-timeline-with-controller.html
index c861001de83a735c29cc96f812ad2da08598e51d..8bc4eff094cf5e63d1a4a95f6347a2191434878d 100644
--- a/LayoutTests/media/controls-timeline-with-controller.html
+++ b/LayoutTests/media/controls-timeline-with-controller.html
@@ -16,6 +16,12 @@
             {
                 testExpected("video.controller.currentTime", 0);
                 testExpected("video.currentTime", 0);
+                // Wait for the seek initiated by the "bringing up to speed"
+                // step to complete.
+                waitForEventOnce('seeked', seeked);
+            });
+
+            var seeked = function() {
                 testExpected("video.seeking", false);
 
                 // click the middle of the timeline
@@ -31,7 +37,7 @@
                 testExpected("video.seeking", true);
 
                 endTest();
-            });
+            }
         </script>
     </body>
 </html>