Vista - I must be bored...CompositionTarget.Render question

While browsing though the PresentationCore code in .NET Reflector and found
this:

Note: this is a method on CompositionTarget...

void ICompositionTarget.Render(bool inResize)
{
MediaContext.From(base.Dispatcher); <<<<<<<<< ?????
if (this._rootVisual.Value != null)
{
bool flag1 = false;
if (EventTrace.IsEnabled(EventTrace.Flags.performance,
EventTrace.Level.normal))
{
flag1 = true;

EventTrace.EventProvider.TraceEvent(EventTrace.PRECOMPUTESCENEGUID, 1,
this.GetHashCode());
}
this._rootVisual.Value.PreCompute();
if (flag1)
{

EventTrace.EventProvider.TraceEvent(EventTrace.PRECOMPUTESCENEGUID, 2);
}
if (flag1)
{

EventTrace.EventProvider.TraceEvent(EventTrace.COMPILESCENEGUID, 1,
this.GetHashCode());
}
this.Compile();
if (flag1)
{

EventTrace.EventProvider.TraceEvent(EventTrace.COMPILESCENEGUID, 2);
}
}
}


Obviously I dont have comments in Reflector so there probably is a legit
reason for this method call, but from what I can tell MediaContext.From
doesn't do anything within this method. The point of MediaContext.From is to
get the MediaContext associated with the dispatcher for the current thread
but it's not assigned to a local variable, so I'm very confused.

I then thought it might be to ensure that the media context is created
(which From will do if its not already), but I ran Reflectors analyzer on it
and found that CompositionTarget.Render is only called from
MediaContext.Render. Thus MediaContext must already be created.

Looks to me like pointless code, but if it's not then I'm curious what it's
for.

Thanks