Let MediaController.currentTime return the position previously set

Source/core/html/MediaController.cpp

Index: Source/core/html/MediaController.cpp
diff --git a/Source/core/html/MediaController.cpp b/Source/core/html/MediaController.cpp
index e887df31c4cd44f4394dc47658dcc31265ae5169..fd0fb14ac275a69f11c61096b9cb2b0da88aab71 100644
--- a/Source/core/html/MediaController.cpp
+++ b/Source/core/html/MediaController.cpp
@@ -170,6 +170,7 @@ void MediaController::setCurrentTime(double time, ExceptionState& exceptionState
     time = min(time, duration());
 
     // Set the media controller position to the new playback position.
+    m_position = time;
     m_clock->setCurrentTime(time);
 
     // Seek each slaved media element to the new playback position relative to the media element timeline.