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Description of problem:
Using the accessibility menu of the same kind as inside the logged gnome-session, the 'High Contrast' option doesn't make any changes to the theme in the login screen (gnome-shell front-end for gdm).

Version-Release number of selected component (if applicable):
gnome-shell-3.4.1-5.el7.x86_64
gdm-3.4.1-3.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
Toggle 'High Contrast' on in the login screen
  
Actual results:
Nothing happens

Expected results:
Theme switches to high contrast

I don't think this is a bug, really. It is just that the shell itself does not have any highcontrast theme - if you go to an empty desktop while logged in, and hit the highcontrast switch, you won't see any difference either.

Maybe it makes sense to hide the High Contrast switch on the login screen? I can see how it is confusing ...

Lets take this to an upstream bug where I can just add the 'ui-review' keyword

https://bugzilla.gnome.org/show_bug.cgi?id=686395