Linux: implement ShouldRenderRichAnimation() based on $DISPLAY.

Linux: implement ShouldRenderRichAnimation() based on $DISPLAY.
Local display names start with a colon; remote ones don't.
BUG=none
TEST=none

[Evan Stade, 2009-10-03 00:38:42]

I am not the right reviewer. Try: agl, dank, evan maybe.

But I wonder whether there is some gtk setting we can tap into?

[dank, 2009-10-03 00:45:22]

Seems plausible.  
It might be nice to have a way to override this for people with
really fast networks (or who want to pummel their systems)?

Alternately I suppose we might check for the X shared memory extension.

[Mike Mammarella, 2009-10-03 00:47:53]

On 2009/10/03 00:45:22, dank wrote:
> Seems plausible.  
> It might be nice to have a way to override this for people with
> really fast networks (or who want to pummel their systems)?
> 
> Alternately I suppose we might check for the X shared memory extension.

I was just going to point out this thread where checking for that is suggested:
http://www.mail-archive.com/gtk-devel-list@gnome.org/msg06432.html

That's a larger patch and I'll leave doing that to somebody else if we want to
do it that way.